Just thinking out loud - wouldn't ITS fit better in small bore than big bore? The fast ITS times are right there with the EP - FP cars. And, if necessary you could move the SSB/C cars into the SSM group - I know the SSC driver who was paddocked next to me this weekend would have loved to get out of small bore. Or is the idea to not have cars from different classes, but of comparable speeds, running together?
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idea is to avoid having different classes running the same times together. then they interfere with each others races. don't want too big a gap though, or else the passing gets scary.

as and its are a good example of why avoiding mixing different classes running the same times is important. the as cars make up their time on the straights. its cars make it up in the corners. this leads (led) to some crappy racing in the corners for the its group.

ep-fp might have the same issue with its cars. ep-fp have trick suspensions, brakes and slicks. its cars have engines...might suck for the ep-fp cars.

this is why grouping the it classes together makes sense. similar levels of prep.