I seem to be stuck at around 140 BPM with 16th notes. I constantly have been slowing down, working on fretting hand / legato and alternate picking accuracy, then bumping back up to "kill yourself" tempos (what John says in "Rock Discipline") and back down to 140. Still, 'am struggling to accent each click/downbeat. The only thing that's seemed to work to get past this is to turn the tempo down halfway and play 32nd notes, but it removes context from the beat, which is unavoidable live. I can almost do legato at 200 BPM with no problem, but I guess synchronizing both hands instead of one takes twice as much work.