As another data point, last month RMVR here in Colorado had 39 FFs and 25 FVs at our August race (our "Race Against Kids' Cancer"). I don't have data...
I wanted to add that I have seen tanks removed from formula cars to refill. Upon inspection - I found corrosion that looked like a small rust bubble...
Assuming you are switching to scca legal slicks, which are radials, as a minimum you'll want lots more camber, like 3-3.5 degrees vs 0.5 degrees, and...