Actually, yes Al. As your on.
Grip level. Sc3 mo or F1's?
Bearing in mind TB spent a good amount of time telling me a wider tyre won't make much odds. (It does, but not by this much)
Thats not quite what I said, now, is it Mr G. I said you run a risk of over tyre-ing (if such a word existed) one axle (rear in your case), delivering that understeer that I spent ages dialling out of the Silver Bullet...
Having tried SC3s (a while back, and most likely generic), for grip I'd put them in this order:
SP9000
SC2
SC3
....
F1
In terms of durability:
SP9000/SC3 broadbly the same, SC2 a little less. Too early to comment on F1, but not looking great
Have you tired generic SC3 (which is what I suspect I had)? If so, grip levels, how do they compare?
I'm gonna be needing some new tyres on front of both soon (couple of months I guess), and not convinced with these F1s, so will be looking around again. Based on my previous experience of SC3, it would be a leap of faith to try them again