I use M2/3OP for multi. On an average, if I attempt 11 cubes, I end up spending like 29-31 minutes memoing the permutation, another ~7 minutes to memo the orientation, and the whole of the last cube, and a quick orientation revision. During exec, I solve the first cube (last memod), then I first fix orientation on all the cubes, then permutations. Total exec time is like ~1.5-1.6 minutes per cube.
I have attempted small multi attempts with OP, and am extremely uncomfortable using it, as I am used to a 8 letter set for my corners now. I find it pretty painful to recall memo with a much bigger letter set, even though there is no orientation.
My question is: Should I try to switch to OP for corners (and maybe BH ultimately), or is there some scope for me to continue with 3OP? My long term aim is to fit 15-16 cubes in an hour (can currently fit 11-12). Is there anyone who's good at multi and uses 3OP for corners?