Is anybody running big HP bike engines and
are you having any insain problems with wheel
spin when pulling away.
Dont mind some but neither do i want to be
sat still waiting for the tyres to grip.
our LSD diff only allows 128mph top end so
gearing maybe a little low

Depends what you class as big HP, plenty on here running zx12's busa's and R1's. My humble ZX9 will spin in the first 3 gears if i boot it hard enough, If your gentle with the throttle and clutch you should have no problems setting off no matter how much power you have. Maybe your controls are set up wrong, try lengthening pedal travel a bit and see if it helps.

Echo wadders reply, throttle control is the key, let the tyres grip then give it large rather than light them up and wait for them too grip.