I used to have Raceface GoodnEvil grips which didn't give me significant calluses but I'd occasionally get finger pain (not arm pump) on long rocky rides. So I put some ODI Troy Lees on and they're easier on the fingers (much thinner and stickier) but are causing big calluses to build up which then blister underneath, which hurts.
I'm not sure whether the problem is due to the grips being too skinny or too grippy or both? I think my gloves are sticking to the grip, thus rubbing that bit between fingers and palm, where gloves often bunch up. My guess is I want moderately thick (GoodnEvil v thick vs Troy Lee rather thin) and moderately grippy grips? The problem seems worst when it's hot so my hands are damp with sweat, so a grip that is maybe harder rubber but with a grippy texture for wet/mud might be the answer? Or maybe something that grips laterally but not in rotation like those BMX grips?
Not foam - too slippery and they fall apart too fast. Lock-on for convenience / protection of carbon bars.