Percussive shot is terrible imo, fills up resolve to... barely knock back the enemy, also cover screen is practically useless. I'd put those points into the reduced cooldown on leg shot. I also run deep ss though and love it, everytime I watch these hybrid spec pvp videos I cant help but think the dmg looks incredibly underwhelming.
Spec I'd recommend http://www.torhead.com/skill-calc#700bcrrdRoRgzZbfZh.1
I understand the 31 point talent is garbage but, your already up there.