I suck at memo, that was pretty fast for me. No memo techniques really feel comfortable for me, I can handle images reasonably now I've practiced with them, they work best but I still don't really like them. Also bear in mind I have a wierd system to give me flexibility, easy learning and some hax, rather than just doing letter pairs which are almost certainly faster. Even with my smaller system I pause too much sometimes when turning targets into images, so there's still some improvement to be made.
Yes, I've used all comms for a while now. I understood comms long before I started BLD so although I started with M2/OP/r2 it wasn't too difficult to switch, and I've always used comms for centres. Doesn't mean all my comms are good though.
Tl;dr I probably pose little threat to UKNRs