Is there such a thing as too much power?

I don’t see explicit current specs for that amp but if it does in fact double into 4 ohm as indicated that is a good alternate related indicator that it is designed to drive difficult loads effectively. .

If you don’t have enough power you clip.  When you clip good watts go bad no matter how awesome they were to start with. 

Clipping is hifi public enemy #1 to avoid at all costs.  Wats in reserve are your insurance policy.  Make your amp work too hard and all else is lost.