Power Caps are always across the battery. Putting them on your motor leads do nothing; power still has to go through your ESC first, so your motor isn't getting anything 'extra'. Also think what happens when you hit the brakes... charged cap + brake FET?


Big caps have slower "discharge" rates than smaller caps. If you really think those extra electrons make a difference then you should make up an array of smaller caps instead eg multiple 1000ufs in parallel.

Varying size of cap may change the "feel" depending who you ask, but this is quite subjective. Difference is about the same as changing the drive frequency of ESC... but end result is it ain't gonna double your topspeed.