Without photos is hard to tell what can be causing it, but from looking at how a Roland mesh dual zone snare is constructed, I see that (the one i have ) has a piezo with a foam touching the head, the ohter piezo is just glued to the bottom of the pad (its a single piece of plastic) but if you are using a regular snare, I suggest getting an L bracket mount the piezo under the head not on the center, and the other piezo should be mounted to the sidewall more towards the bottom of the snare, that should be isolated enough to not trigger it unless you are hitting the rim... my conversion was like that but I got tired of having to dissasemble the drum everytime something failed, I bought the DDrum Red Shot triggers ($15 each) for the toms since you don't really need much positional sensing (which they do have to a limited degree), I also bought the Roland triggers for the snare and bass drum. so far I have a very nice 7 piece set with 8,10,12,13,14, toms 14 snare and 22 Bd, with 7 cymbals using the Go-edrum controller. i'm going to incorporate 4 other pads that I have from my Roland TD11 as extra percussion and effects. Modules are Roland TD-11 and Alesis DM5. Oh also using Remo mesh heads.