After lots of trial and error 7 X 6 minute runs cracked it after run 6.

so this is it car was fast and punchy.

rollout 48mm

setting = value
4 9
9 35
10 24
12 30
13 4000
14 -2
15 250

GM 13.5 1s

rollout 72mm

4 9
9 45
10 24
12 24
13 3000
14 -3
15 350

just too mention the 10.5 was in a WGT and the 13.5 was in a 1/12th