4WD handling problem

[chrispattinson]

I have a handling issue with my 4WD car, and wondered if anyone has a suggestion.

Just been trying the car on a smooth tarmac surface, with worn minispikes on, therefore there isn't much traction.
The car is setup to the best of my ability, on a setup station for angles and toe in and steering throw etc., using a vernier to check tie rod lengths etc. I threaded string through the centre points of the car to get the left right balance correct.
The car: CAT 2000 with Novak 4.5 brushless.
The problem:

When the car is rolling, it tracks straight.
When the car accelerates hard from a standstill, it pulls right.
When braking (one way unit fitted) it dives left.

The only thing I can think it might be , is if I have balanced the car (left right), but added the weight too much to one corner. I dont have the required 4 scales to check the load on each tyre. If anyone has any suggestions as to why the car is behaving this way, or how I can get the weight distributed evenly, I'td be appreciated.

Could this be down to the offset drive train on the CAT (the belts dont run exactly straight, they are angled), but I doubt that the tiny angle, would affect it this much.

I have checked chassis tweak, everything seems flat and true.

Thanks in advance, Chris Pattinson.