I've been experimenting with the V710s this season on JGW's recommendation and I've got to say I am really impressed with them. I have only used them for autox so far, but I have found they like lower pressures than the V700. I have 35 runs on them now and have kept lowering the starting (cold) pressures and they keep getting faster, or maybe it's just that I am trusting their grip more, I don't know.
I am down to 24F and 25R starting pressures and end up at about 28F and 30R hot after 4 runs (with air fill, not nitrogen) with the 205/50-15s. They have shown excellent wear so far, and I still have not gotten enough rollover on the shoulders to reach the little triangle marker on the sidewall with my 2360 lb. SWB 911, so I may even be able to go lower. I used to run the V700s at 32F/34R when hot and they would rollover farther.
From what the Kumho engineer said at our tech session, heat management may be an issue with them in continuous lapping sessions, but I have been careful not to overdrive the car, keeping slip angles reasonable (most of the time, anyway.
)
Like James says, try lowering them a few pounds and be smooth! Your car is lighter than mine, JP and you're running a bigger tire.
TT