I'm on a Mac, so that might have something to do with it. I use SteerMouse to disable OS X's mouse acceleration. The SteerMouse driver also has a sens setting. System default is 400, mine is set at 200, so that no doubt affects how QL is implements my cfg settings. I manually measured doing a slow 360 in-game and came up with roughly 34 cm/360.
I also loaded the raztrainql_beta3 training map and practiced some strafe jumping. I was abysmal. I wasn't able to accelerate very much and I couldn't sustain the acceleration beyond three jumps. I clearly need to figure out what I'm doing wrong, starting with your suggestion about my key presses.