Yeah, I read some references to "Saturday Night Palsy". I just wish my doctor had known about it and saved me some time and money. Sorry for your ongoing problem. If you haven't tried the methylcobalamin variety of B12, you should. It is supposed to be much more effective. At least 10 times better absorption rate if I recall correctly.
Back on topic, I just tried set cl_movement 0 and played some minstagib. It made a huge difference for me. So I don't think lag was my problem so much as the lag correction failing due to my zig zags.
I wrote a script with key bind toggles for cl_movement, gl_finish and sv_maxrate, so you can easily fiddle with these settings in game, without opening the console. I'll post it in the performance forum and comeback here with the link.