Generally, more muffling will eleminate these issues (if there's no connection issues I mentioned in a previous reply) As the last guy said a decent thick 2/3 ply head will also be a major step in the right direction to help with this. Raising the mask time too. As you said, harder hit which dig into the head will lead to this. If it's any consolation, I get this issue with a Mimic pro which has as a really advanced trigger interface, so it's not the module, just the combination of heads, tension, muffling, setting and lastly technique. Though adjusting the last one is a last resort, you don't wanna be rethinking your whole playing technique to a point where it's unnatural.
Hope you figure it out!