"Ajust" and "shuld" are not words. Only a warning since the post is fine otherwise, but consider a spell check plug-in of some sort.
As some of the issues with chaining cooldowns with prep are tied closely to Overkill / Vanish I would say this shuld be a candidate for change. I dont see why prep shuld not be the prime pvp spec. As it stands now it shuld add both offensive and defensive advantages. But there shuld be ways to look at Overkill to ajust this. If you put an "Exhausted" (for a short time 20 sec) type mechanic that would prevent chain vanish, but in turn granted other offensive benefits instead. This could be a buff to both pve and pvp and adress the issue off chaining low cost openers with a huge energy pool.