What hot tire pressures are you running, I just tracked my non R with 315x35 rear and 315x30 front. The car was fast but had way too much push so we only ran one session.
I bought the BRM toe adjusters and when my installer tried to install them he found they were a sloppy fit and would not install them, I sent them back. We were able to get all the adjustment we needed with stock parts in rear.
Sorry for asking for help with this I tried to search but could not find this. Need DIY for removal of bumper cover can't stand looking at poor panel fit any longer.