i have driven track prepped caymens of a few varieties on the track, track prepped challenge Ferrari's, and 996 and 997 Cup cars on the track, and owned a track prepped 2500lbs 400whp older 911. but have never owned a caymen nor do i have any interest, and have never in my life been passed by any caymen on comparable tires and non-pro driver in the N/A NSX
Aren't your friends likely on slicks? thus running more aggressive camber and within 1-2 seconds of randy. Aggressive camber easily destroys street compounds..
If your so flabbergasted by by the GT4 then just buy one.
I'm @ 4.6PW / 2500lbs with the turbo NSX and trying to catch up to half million dollar 991 CUP race cars and Lamborghini Huracan supertrofeo race cars that go home in trailers.
I don't worry about street cars like GT4's nor GT3's and since the turbo haven't had to point anything by that drove itself to the track.
You mentioned you have a "track NSX", if you don't mind sharing, what weight and power, wheel/tires and suspension, brakes and areo are you running?
this was 3 weeks ago on 1 year old NT01: white 991 CUP race car, red Hurcan supertrofeo race car, silver radical... All on slicks and massively effective aero
https://www.youtube.com/watch?v=uM5RtzCpQ1w&t=45s