Ok so good and bad:
Good - turn-in, mid corner adhesion and "potential" acceleration (will get to that in a moment).
Bad - breaking distance, a little oversteery for my tastes, "actual" acceleration.
Ok so my method. Ran several laps with the fastest Adaptable setup and changed the wings to 6/6 and the rear camber to -2.6. Also, for TT'ing I always use the "fast" throttle engine map. Manged a clean 1:35.5-ish.
Then used your setup. With better cornering, especially in the S-curves, I did lower that with a new clean lap of 1:35.2-ish. However acceleration was maybe just as good as the default gearing if not a wee bit slower. Also breaking performance was noticeably worse at the hairpin and final chicane.
Lastly I combined my initial setup with your gearing. NOW things began to come together for me. Acceleration and breaking were noticeably improved over default as well as your setup. Pretty quickly I lowered my clean best down to a 1:34.587.
So based on the couple of setups I've tried, coupled with my default setup TT'ing experience, I'm thinking that the physics engine really gives preference to lower rear camber settings when it comes to acceleration and breaking. This basically makes sense to me, although I am not certain if the positive effect should be this pronounced.
I recommend you try your exact setup and only change the rear camber to -2.6 or -2.5 and see what you think.
Oh yeah full disclosure, I am driving with the std 360 pad, TC at Full, ABS off and Auto Tranny.