Tony is right. And the B5 has a ton of bottom so 1.0 springs are the highest stall you probably want. The shoes can be getting hot and not grabbing. But that is not your only issue I think.
Odds are pretty high it's your tune like Tallyram said. It is easy to get the bottom too lean especially if you are tuning it cold. Take it out and warm it till like you said, you don't have bottom snap and then bring her in a fatten/rich the bottom 2 hours. if it's better then you are going the right direction, and might even need more. Could also be reverse of that and be too fat which means doing the same thing in reverse to lean it some.
check If your clutch bell is discoloring due to heat as well.
There's a Great B5 tuning guide in the B5 thread. And the Company owner (Werks/Ron) is always on there to help people.
Good Luck.