MMPro question

Hi,

I have this setup:
MMpro, 0 punch, medium start power
1790kv 4 pole motor
Lightweight LST2: 5kg rtr
Geared for 30mph, on 5s4000mah45c

The truck hesitates to take off. If I start really slow on the throttle the car starts moving and if I then apply more throttle the car will take off.

But if I try to take off with more or half to full throttle the truck just crawls. I have tried 0, 5 and 10 degrees timing with no effect.

Once the trucks drives normally there's no problems at all.

Any idea what could cause this? It can't be the battery because it works fine in another setup with a MMM.