You have at least 2 CRITICAL issues in your build: not taking Inq.Seal and Word of Renewal, so you lose flat damage absorption, heal and racial damage.
Also, too many points invested in WPS and Static Strike.
Then, I can’t figure out what damage type are you heading for?
If fire, then check this guide: [1.1.5.1] (2H Ranged) Let's bring BIG GUNS TO THE BATTLE - Desolator Purifier [c+] [sr+]
If pierce, check this fine build: [1.1.4.2] Top Gun - 6,5 seconds Mad Queen, 6m Crucible, SR 65-66 resilient no greens Valdun's Purifier