Well on 16th, I play at around 140 bpm at max. And to answer your question Incidents, no I don't play them at 20 bpm :D Well hopefully I'll reach 200 someday.
And the thing without metronome.. I play in time without it meaning, I don't slow down suddenly for the harder parts. Simply sitting down playing the hard bits until I get it. But obivously when I want to get faster I use the metro once a while, cos my biological metronome I call it can't keep time. So don't get me wrong when I say I don't use the metronome sometimes.