Yah, well, in that case, lowering you final drive ratio (FDR) will work to your benefit. It's a disturbing trend I see in the US, with overpowered systems being purchased and used in the wrong applications. I don't mean you so much, as 13.5T is not bad, and is easily compensated for, but those who would buy what is comparable to a 6.5T, then when they have problems with drifting, will then modify the chassis, rather than replace the motor, which is where their problems originate, in the first place.

In your case, it would make a difference, if it will fit. As stated before, there is very little room for motor adjustment in the TA06 motor bay, so with the new spur, which is a dead-on choice, btw, just find a pinion that will fit. Again, you are looking for the best combination to enhance smoothness of power delivery, than anything else. Go ahead and try it, and let us know how it work out!