I suggest eliminate the tier 5 from pvp and make t4 the definitive tier to play without ap limits or restrictions the only restriction should be that ap must be similar between the players that are going to pvp (between 25-50 cp difference can be acceptable) there a few reason of why do this.
1. This is a personal reason, I have 6 months playing this (as orc) and I still cant pvp the big guys seriusly did I must play like another 5 months to get the level 17 unit to be able to pvp in T5? is frustating for me cannot have 2vs2 dues to the limitations of the tiers and having pvp reduced and significantly less opponents.
2. Level reason, I think a level 13 unit have enough gearscore to can be well geared and nearly or can be capped it is well geared and no ability or gear differences for that I think they can match against the big guys of level17+
3. PvP will be more dynamic and active now that high level players finally can face the big guys that they cant touch before because most their units were on T5
4. Like the first reason, it will be easier to get the definitive tier and dont need to play for like 1 year to be able to pvp in T5
What do you think guys?