This is not possible to make it.Why?I really would like to see some response dev to this topic so much discussed here.
Again, I will suggest gates equal to the Avalonians and an increase in the channeling of the A-out.
It's just giving a chance to those who do the dungeon, to have a chance to defend themselves.And give those who dive the chance to dive.
It is not difficult to solve this, what a delay.
PvE teams 4-6 (PvE builds maybe with PvP sets)
Divers 6-9 (PvP sets)
Different risk vs revard
Different team power
For your proposition gate destroy must be shorter than A-out.
So PvE team is ready but still its weaker about amount of players in team (general) and PvE team risk more vs smaller revard.
Only 1 way to fix this is
Single dungs. Max 2 players in dung going in from 2 randoms entrances.
Blue dungs. Max 5 players and your proposition with longer A -out and gates.
About the builds: PvE x PvP, the choice of the build goes according to what the player decides best for that moment. If you use an incubus mace it will obviously improve your PvE, and it will make your PvP more difficult. But that does not mean that it is a rule to use incubus, it is optional for the player.
When there are 9 divers, they are usually pt where the players are very bad, in this case a pt of 5 can easily kill them.