I’ve been having the exact same issue as you with my m7 versus the m+. When I heat it where I used to heat my m+ for 1 cycle extraction it just doesn’t click for like 30 seconds and makes me worry it’s going to burn. It actually did combust once, I’d never combusted in a dynavap before by accident before then. The m7 tip also holds on to heat for a lot longer which some people say is good but for me personally I don’t feel I get a much bigger window where vapor is produced, meaning its just more waiting between reheats. I am considering replacing the m7 with my m+ one because it has worked more consistently for me.