Player help. Optimizing my pathfinder Gunpriest

[Nosta]

This as a back up character but I like having one built my gm tends to play for keeps. The build is as follows

Asura Spawn Tefling (Tail feature)
Gunslinger(1)x Warpriest(6)

Blessings (Air And Travel)

Sacred weapon (Pistols)

For feats I have the following picked out

Lv(1) quick draw
Lv(3) rapid reload
Lv(4)-war priest bonus: PB shot
Lv(5) precise shot
Lv(7) Rapid reload
Lv(7)-war priest bonus: cluster shots

[Holya]

Going to be honest here. It seems like no one wants to touch the gun slinger from pathfinder.. Or a few other classes so you might never get a proper response here and I've got no idea how to make a gun priest work better then they already do.