How did you even get the 5.8%, 8.9% and 11%? AA damage has no diminishing returns and it stacks multiplicatively if there are more than 1 buff influencing it, meaning 40%+40% localised within one buff is 80% under any circumstances, but 36% + 60% provided by two different buffs would turn out as 117%.

Lol
Theres a "cast time" Hidden in animation Q1 no counting here. Thats why You play Kite Style, not bruiser Style against other melees. The hitbox is not Big enough to garantize charges at gvg, but no problem it's a skillshot.
Q2 Yes, it's a problem at CD. No body plays a singlet Target skill at open World. Would be stupid.

Spam post... you've already posted this.

This post particularly has bad math, bad language and bad format...

You're comparing abilities that aren't comparable and ignoring things like AoE damage, utility, skillshot/non-skillshot, damage modifiers on passives and skills, etc...

At the end of the day you can't quantify some of those parameters and your calculations end up becoming obsolete.

There's some data sources though telling us how many times spears are used in CD's, HG's and Crystals and I can agree spear Q line is strong, specially Q2 in certain content.

There's other Q lines pretty strong also...

I would say the coming nerf is justified. It might be too much or too little but until we see people playing it after the patch and how it affects the meta on CD's' crystals and HG's it seems only a wild guess.

Oh, you mean the % difference between pre and post-nerf. Got it.

Now if it were me I'd compare not AA or Q damage, but rather damage in the whole weapon toolkit. I'll do a basic comparison between 2 weapons I would assume are the closest in their respective roles, yet are in different trees: Pike and Claymore with an IP of 1103 and 1104 respectively.
Since scaling with AA buffs is multiplicative (most complaints seem to go towards cloth spear users), I will take a 60% mag/atk bonus as a baseline (Full cleric gear with damage passives on).
I'm not gonna go frame-hunting to calculate the exact animation times for each skill because it's just too laborous.

I will go for the W+E burst-routes and use AA and Q as the main source of sustain damage during cooldowns.

Claymore (1104 IP) skill set (60% atk bonus included, passives excluded):

• AA - 190 phys dmg, 1 AA/s, (1.12, 1.24 and 1.36 for each Q stack respectively).
  
• Q1 - Heroic Strike - 453 phys dmg, 3s CDR, 12% MS/AA bonus, 6s duration.
  
• W4 - Splitting Slash - 787 phys dmg, 15s CDR, 2.23s Root.
  
• E - Charge - 1702 phys dmg at 3 stacks, 20s CDR, 0.8s Stun, 1s I-Frame.
  

Claymore fastest burst DPS route from 0 stacks (~11-12s in execution time):
Q (453, 0.35s) --> 3 AA in 3s (0.89s per), 1 stack (190x3=570) --> Q (453, 0.35s) --> 3AA in 3s (0.8s per), 2 stacks (190x3=570) --> Q (453, 0.35s) --> 1AA (0.74s), 3 stacks (190) --> W (787, 0.3s; standtime cancel of 0.5s) --> E (1702, ~0.8s if casting point-blank).
Total damage = 5178, before factoring armor.

Claymore sustain DPS route after burst for next 20s, starting at 0 stacks (Swords favour skill damage over AA damage):
Q (453, 0.35s) --> 3 AA in 3s (0.89s per), 1 stack (190x3=570) --> Q (453, 0.35s) --> 3AA in 3s (0.8s per), 2 stacks (190x3=570) --> Q (453, 0.35s) --> 4AA in 3s (0.74s per), 3 stacks (190x4=760) --> Repeat Q and 4AA 3 times ((453+760)x3).
Total damage = 6898 damage, before armor.

Pike (1103 IP) skill set (60% atk bonus included, passives excluded):

• AA - 237 phys dmg (332, 426 and 521 for each Q stack respectively), 0.8AA/s.
  
• Q1 - Lunging Strike - 454 phys dmg, 3s CDR, 40% AA bonus, 8s duration, 5.45s 10% slow.
  
• W5 - Impaler - 902 phys dmg, 12s CDR, 5.45s 50% slow.
  
• E - Rooting Smash - 1372 phys dmg at 3 stacks, 15s CDR, 5.07s Root.
  

Pike burst route from 0 stacks (~8-9s in execution time):
Q (454, ~0.35s, there seems to be a weird grace period afterwards where you can't AA for an additional ~0.9s) --> 2 AA in 3s (1.24s per), 1 stack (332x2=664) --> Q (454, ~0.35s+~0,9s grace) --> 2 AA in 3s (1.24s per), 2 stack (426x2=852) --> Q (454, ~0.35s+~0,9s) -> 1AA (1.24s), 3 stack (521) --> W (902, ~0.5s, this skill has no standtime?) --> E (1372, ~0.5s, 0 standtime aswell?).
Total damage = 5673, before armor.

Pike sustain route from 3 stacks (most spears dont drop stacks after E) for 20s (Spears favour AA over Q at 3 stacks):
Q (454, ~0.35s+~0,9s) --> 5AA in 8s (1.24s per), 3 stacks (521x5=2605) --> Q (454, ~0.35s+~0,9s) --> 5AA in 8s (1.24s per), 3 stacks (521x5=2605) --> Q (454, ~0.35s+~0,9s) --> 3AA in 4s (1.24s per), 3 stacks (521x3=2084).
Total damage = 8656, before armor.

Post-nerf AA's will deal 237, 312, 389, 465 damage respectively.
Burst post-nerf route will deal - 5491 damage.
Sustain 20s route will deal - 7407 damage.

In conclusion:
Pike has more damage and burst opportunities, while having much less utility.

The nerf seems pretty reasonable on paper since spears, if played correctly, may never drop their stacks. One of my concerns would be 1h spears which will loose a ton of pressuring damage as a result, especially the regular 1h spear since it's the only spear that drops stacks on E and might need a buff to put it in the line with other spears.

I made the mistake of assuming my recording runs at 60 fps, while it's actually at 30 fps, so the actual value for the grace period is about two times bigger.
Fixed.
Made a recording of the skill in action and counted the frames it takes for it to come out. Excluding both E abilities, which are just very rough estimates made via a timer. Cast time data for Sword Q and W can be found in NDA patchnotes.
Feel free to add your contributions.

Why are you making suggestions then?

I agree one handed spears (included heron, and daybreaker) need damage buff due low damage rotation.