M1A2 Commander:

It's a great thing you guys had the testing in place!
With 2 new M1A2 tank having the exact same issue, it seems likely my distributor current batch has issue.

However like Shenlonco has mentioned, maybe there wasn't any issue at all.
Just the way Iplay didn't set the break-in correctly.
Ikinda got this feeling because initially the tank works fine.
That is when the rotor and the brush are in proper state.
However when Istart speeding straight, the heat generated may be too much for proper erosion of the brushes.
This may therefore result in different surface area contact of the brushes to the rotor for each side.
And maybe this is why with one side brush is having more surface area than the other, the tank will veer to one side only.

Ifeel changing my gearbox will work too since the motor is one of the component in the gearbox.
However Ialso got this feeling no matter how many gearbox Ichange, the problem always come back unless Ifound the root issue.

Probably what I'm gonna do is to just provide whatever information Ihave to the distributor and see what VSTANKcan do.
Isure hope is something that can make my and all future VSTANKproduct reliable!