I just read in Grassroots that the other sanctioning body has signed a contract with Toyo to supply RA1's for all their spec series for the next three years. That would seem to suggest at least a small variety of sizes.

Do the RA1s really last that much longer?

What are the options for less spendy tires? Rubber amounted to a pretty big chunk of my budget last year. A harder tire, and give up speed? A grippier tire, then run easier? A bigger tire, which may not heat up and scrub off so quickly? Quit whining, and accept that I'm gonna shred tires? Spend $10k and find a lighter H car?