There is a much more simple and effective solution to correct the imbalance between t4/crafted gear and pvp t3 gear. This will also help to correct the imbalance between new and veteran players, inviting more players to stay and enjoy playing AoC pvp.
I'll keep this brief, as anything simple should be. Give a minor boost to pvp t3 armor. Give a moderate boost to pvp t3 weapons (all types) and accessories.
Now, close the gap in stats between pvp t2 and t3 gear (especially weapons,) and then close the gap in stats between pvp t1 and t2 gear.
Don't even bother introducing a new grind to the game (pvp t4 gear) until this is done and a new tier of pve gear is introduced.