Alright everyone... got a dlimena.
I demoed the SM5's in a few different grinds (56.14 F, 56.10 S and 60.11 K).
Currently have SM4:
56.11 M bent to 55.10
The K Grind didn't outperform my M so the M is staying in (might move to SM5 later this year)
I didn't feel the F was better than my M (hit all sorts of shots including bunker shots). BUT the S Grind was AMAZING! Since I hit the 56.10 S I naturally want it but feel I should do 55 to keep my spacing.
I'm not sure if I should go 54 and bend to 55 (which gives me a little more bounce) or go the other way. HELP!?