Two things:
I haven't seen this in any screenie, but are there braking markers anywhere in the run up to the chicane ? Something simple as 1 cone vertical with one next to it pointing in the Direction of the turn about 50 meters before, (eg < /\), then add another vertical at 100 m (</\/\) and add a third vertical (</\/\/\) at 150m. I think this would help judgement of braking points. Perhaps put it on the inside of the course, so they won't be as likely to be blown away each lap by the first car and screw up the 20 behind.
#2: I was thinking of asking someone to drive the SC for the rounds it would be used for, but I think that if I get used to the XFR well enough (and get decent kb settings and a setup for it...HINT HINT !) I'll drive it for rounds at which it will be in use. Of course, I am hoping it will only be needed(aka used) for any formation lap for the Kyoto ala Rockingham round. I like the skin for it, indeed