I've had good results with Cooper Corbra's...then again I haven't tried the Kuhmo's so I couldn't honestly give a comparison. Keep in mind, my car is in the vacinity of 3600-3800lbs with me in it.
I was able to pull a 2.2 60' time at Atco raceway on these rather skinny 225/60R15 Cobras with a stock convertor and a little wheelspin...not too bad. Wet weather traction is also very good.
New Toy- Stone stock '88 T-bird Sport in need of some TLC
1988 Cougar XR-7- HO/T-5 conversion, cracked block prevented from reaching full potential.
RIP '88 T-Bird....firstname.lastname@example.org...best sleeper in So. Jersey, now it's taking a permanent dirt nap.