Thanks for the PM. To address a few things in this thread... The bike I was using is link to in my sig. It has a high BB (one of the session leaders tested it with their brick). It has also 165 track cranks (omniums). I don't think the issue was that.
The front tire was a vittoria rubino and the back was a cheap schwalbe tire. Both are black in the middle and blue on the edges. Both had tread left.
I was using road drob bars. The last time when I went down I was riding with mks gr-9 pedals which are fairly narrow.
I believe I was up to a proper speed each time I fell. I was told by someone watching that even on my good laps it looked like my lower tire was sliding down and that I was correcting for it.
I might have been tensing up but of that I am not sure. I am typically a very confident rider. I think at this point I will have to go back at least one more time, I can't leave something like this on a bad note. Thanks for all the help from everyone thus far.
Jonathan