I have considered trying B - just to see if it kickstarts me to a higher performance. In C, I seem to be able to stay with the front bunch most of the way, then a few above-C riders get away and grab the first few spots and I end up 4, 5 , 6 ish overall and near the top of the legal C's.
I've not been brave enough to try yet.
Looking at the results from last night, I probably couldn't of matched the first 4 guys. The others on B cat were a minute or so back, so I could of ended up in no man's land without a group, solo. That would of ruined my speed compared to drafting in a pack. I then could of easily been caught by the front runners in C group.
I'll try again in B cat on another flat course, but it will have to wait a month or so, outdoor activities now.