i55 PvP crafted gear > DL gear. i90 PvE gear > i55pvp gear

TBH I'd get the i70 PvP bow if i were you, that extra 30 morale helps. You might hit harder with a relic +1 but tbh the accuracy and skillspeed on it are meh.

Only times I'd consider using a PvE weapon would be the primal extreme bow (Elfin), or possibly allagan altho it also has some wasted stats on it too.

"i feel my late arrival on the pvp scene puts me at a disadvantage"
Yeah true, especially if you're solo queueing. I would recommend queueing for lvl 30 and 40 brackets of PvP where gear isn't as important. The mark and exp difference between 40 and 50 (wins) aren't too massive.