My mate tried the Kumho Ecsta V70A's in firm compound and hated them. But these were in 88y which is no use for our cars weight, perhaps far better for a lightish Caterham.Maz, you're a funny one mate. You've spent so much time and money sorting the geo and so on with the car, but still run ditchfinding tyres (relatively).
A few tyre suggestions for you, assuming you aren't going to track it and wreck the tyres:
Avon ZZR
Toyo R888
Yoko A021
(would say A048 or A032, but your car will eat them in 4-5,000 miles)
If you think the above will wear too quickly, try to find some Kumho Ecsta V70A's if poss. The Caterham guys have just started using them and there is a real buzz about them.
James.
I've found that just because tyres are good on on platform or Marque, doesn't mean there any good for other ie GYE F1 asymmetric, great on our platform, rubbish on a Mondeo V6 24V