@bread82, quickly tested your tune, was surprised how stable it was, had one mistake on settings due quick apply of tune, tried BB 5/5, managed 1:03.70x on Tsukuba(4laps driven totally). Testing that your BB later.
Later: your brake balance wasn't for me, I lost grip on all wheels or rear wheels on corner entry, managed to run 1:04.1-1:04.5 times, reducing balance and time improves, for me it was easiest to control tire traction on corner entry with 5/5 balance, run 10 laps with that balance and worst time was 1:04.1(drive bit out), all others were between 1:03.365-1:03.886. There is done tenth to improve if I could get clean lap, and no mistakes on braking.
@sinister your cleaning lady has left trash mail on your box.. Clean up bit