Steer clear of Avons, they are shite
To be honest, spinning up in 2nd gear will always happen if you have loads of power, and just floor the throttle. What do you class as "big power"?
I could never get my car to launch properly. It either bogged down or spun up. With the clutch/ turbo and tyre combo it was a nightmare to pull away quick. If I just floored it, then 1st and 2nd would be wasted, 3rd would be ok, but would still scrabble for grip. That was at 2bar of boost on a T34, in the dry of course lol.
Suspension also plays a MASSIVE role too, a nose down kind of angle will help and have a play with softness to. Adjustable suspension components will help no end.