Like Doug I use a Thumbie too, which seems to balance the M9-P better as well as giving better grip. I haven’t had a problem with the adhesive strip and I’ve used one on my M8 for 18 months or so.
I use a Leica 1.25 magnifier most of the time (because I forget to take it off:o) but it helps with fast lenses especially the 90 APO-Summicron.
An Abrahamsson softie that helps me get at least an extra stop and maybe two if I’m lucky.
Pete.