32, I may not be the best for your question, maybe tighed1.

If I understand you were going to just do some of the ribs. THat would be odd to me as the edges would carry all of the stress and distort the belt, again if I understand it all. Me I like bigger pullies though I can not figure how to get one to fit in the current design. My pulley saver had to go to a longer belt to fit in all the increased pulley lengths, so I again ask Tighed1 to step in on your query...Woody