The only thing with doing that is it would be ideal on a full track day, but I'm only doing one session at Japfest I just want to try and see what would be best so I don't go out and have one rubbish session from the car not gripping. I previously used Toyo T1Rs on my GT at Donington, and in my first session slightly high tyre pressures (35psi) just would not grip. For the second session I dropped them (I didn't have a pump or anything so at a guess they were <30psi) and it handled a lot better! Online there's a lot of differing opinions as to whether to drop pressures for the Uniroyals (as they get hotter on track and the presure will go up) or to reduce pressures (reducing flex). Daily I run ~35psi to get better fuel economy, but in some corners I've found I get quite a lack of grip recently, but that may also be because of cold roads this time of year. So I'm kind of inclined to drop them for track? Thanks for the reply