From my experience running a 550 4700kv motor, it will initially have a lot of torque, but that can be easily offset with taller gearing—how tall? Trial and Error, you have to do testing. I ran a 27 pinion 55 spur on 3s and then 4s and the 1/10 tc was an absolute rocket at a little less than 1/2 throttle. But that set up was close to the limit as I had to constantly monitor my temperatures. I then tried a 31 pinion, but my temperatures were too high.
And as far as the weight, I didn't really notice any major difference from a 540. Heck, I'm running 1/8 2650kv motors in my 1/10 tc and the added weight is no big deal. It is still nimble and quick.
This was my LRP 550 Dynamic 10l 4700kv set up:
This is a comparison with the 2650kv 1/8 motor:
Had to cut the frame to make it work:
1/8 motor installed:
Ready to go: Note: I added 44.5mm wide foams in the rear and 31.5mm wide in the front to handle the power.
So if it can work for a 1512 1/8 motor, it will work with a 550