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I figure the lower voltage will reduce the amp draw, voltage stress, ripple, etc., and be safe to use. (?)
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Nope, the opposite is generally true, but only if you use a lower kv motor at the same time; voltage drop and current ripple is purely to do with lipo quality rather than voltage.
Given your setup and the size/type of your track, 3s lipo & 2200kv should be fine- 4s would probably be too fast as you experienced. A more common setup is the 2650kv motors on 3s, many people swear by that setup for alot of tracks.
If the motor, esc and lipo are only coming off warm, then it sounds fine, no real need for extra caps unless you really want to, but it doesnt sound like you need them.