The speed a piece should be played is something that you decide independent from your ability to actually play it at that speed. That is to say, a piece should be played at the speed that you believe is correct - stylistically, musically, in line with the composer's express wishes and with reference to convention (particularly for exams/auditions).Once you've decided that, if you can't play it at that speed, you can't play it period.
3rd movement I think 100 to the dotted quarter is good. I can't quite get the initial runs in the 2nd theme well enough. As well, I find it difficult to play most of the development section (and the 1st theme of the recap) quietly at this speed. My hands kinda flip out at this point and I play kinda spazzy-like to keep up with the metronome.
Anyone have any advice that could help with this stuff? The reason I posted the instrument I'm practicing on is in case anyone thinks playing on an upright gives a limitation to the speed at which I can play things.