Stu - Here is what I have been running. It's got the laptime potential of Ivan's superfast MO3, but it requires more "attention" to drive it consistently:

1. S grips front and rear with tamiya hard inserts. Jack sauce; full rear, inside half front
2. TRF shocks, 40wt oil, TRF red short springs front and rear
3. 5mm ride height
4. added 50g of lead to the front of the car (bumper area) and lightened rear using lightweight electrics and removed extra plastic parts; weight distribution of 58% front, 42% rear (this gave the car much greater steering response) and 1250g race weight.
5. ball diff, extra tight...
6. CA bead on outer edge (radially) of tire sidewalls (not on tread surface) to break traction in hard corners and prevent traction rolls.

Very stable, can be driven very hard. I typically use 55D tires (RP 30's with RP inserts) which are good for about a lap (~10 seconds) advantage on a 5 min race. Tamiya tires need a significant break-in period (using lots of tire sauce) to reach the same grip level as the RP's. Also, I am favouring full steering on my controller, i.e. no negative exponential and no reduced dual rate. Requires a slight touch on the controller for straights and sweepers, but gives the car instant response in tight infield sections. The car has been finishing at the top of the A main consistently since I brought it out.