OK :P I don't drive the XRR much (read ever) but here goes.
1. Setup doesn't look that great - understeers in and oversteers out (or is that just the XRR??)
2. Some of the corners on that lap were really good, e.g one but last, but some were pretty bad.
3. Use all the track, e.g T1 and the Corkscrew.