The Miata STS guys have played with the 225 RS3, and I've heard that the 1.8 miata does better with them. but i chose the R1R, i like this tire a lot. Tomorrow will be my 11th event on them and i have noticed them getting way better. I run about the same PSI as you, sometimes it feels sluggish but the grip is unreal.
How are you doing locally this season Paul?