New restrictions IMO :
Round 1 - KY2R - 1st XRR (dominate) 2nd FZR 3rd FXR (fxr is easiest to drive and have better avg.times for race)
Round 2 - WE1 - 1st XRR (dominate) 2nd FZR 3rd FXR
Round 3 - FE4 - 1st FXR (dominate) 2nd FZR 3rd XRR
Round 4 - AS6R - 1st XRR 2nd FZR 3rd FXR
Round 5 - SO4R - 1st FXR (dominate) 2nd XRR 3rd FZR
Round 6 - KY3 - 1st XRR (dominate) 2nd FZR 3rd FXR
Round 7 - BL1 - all 3 cars makes here similar times but FXR is easiest to drive
If you want to be close on short tracks and win on fast tracks take XRR.
If you want win BL1, FE4 and SO4R and suck in fast tracks take FXR.
If you want to suck at almost every track take FZR
.