Well I've tried the above and all I can say is wow!
I race on a multi surface indoor track and I was struggling with getting the front end to bite on change of direction. I could carry a lot of turn in but switching direction the front end would wash out.
I didn't realize that it was 65g so I thought it would be too much but I was wrong it changes direction so much better and you can carry extra corner speed without the front end pushing on. I've also got a smaller spur to move the motor back slightly to help traction and that worked a treat.
The car feels very direct so I only have to adjust my driving slightly from my 410. To be honest the 210 now behaves very much like a 4wd to drive.
Anyone that's wanting to upgrade their 210 I couldn't recommend it highly enough.