Gotta remember weapons have their own proc rates built in; I'd say majority are below 100% so it's not really that bad in practice. I need to look at how those are being handled as well and see if it's doing it right. Other than that I really really don't see a good reason to change the formula.

well each weapon can have its own rate, the system should be based with assumtion of some stable X where X is preferanly 100% to easy up estimates

Take a look at what I have posted later tonight.