Try moving the muzzle socket forward some. The only times I had this happen was due to it colliding with hand mesh, the gun mesh, or the menu. Did you change your hand mesh?
1.1 wont make it any easier to do this. The big thing for me is once it is integrated you wont be able to update your weapon master code without undoing everything you have done to integrate (unless you update by hand which defeats the purpose of me developing for you :P). That is sort of why I am waiting till after 1.2 since I will consider the Firearm portion “Feature Complete” at that time (what I mean is almost all firearm logic will be in at that point). 1.3 onward is all about other weapon types (melee expansion, thrown weapons, shields, bow expansion, crossbows, etc), stuff that is already covered by the Open VR Expansion Plugin (interactions), New AI, expanded inventory logic, new game specific stuff (like random item spawners), and full multiplayer support.