More is ALWAYS better..too a point. Dynamic headroom makes everything sound better.
But.....350 watts can start melting things (caps, Coils, PCB) if you a "Balls to the Walls" kind of guy.//content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif
IF you listen to REAL music (and my guess is you do since you have MKL165's)
Under "Dynamic conditions -also called "Crest Factor" even if you were swinging
34.7 volts *301 watts into a 4 ohm load. With "Music" the average continuous watts would only be 30 watts. So NO biggee.
Then if you can afford it, go BIG! Bi-amping is another choice that works well too.
Also, dampening the doors (DynaMat, Second Skin, Hush Mat, etc) is a MUST.
That actually makes a HUGE difference, especially with our speakers.
Fs is 59Hz on ML165's. They will tear your doors apart. Rattle the shit out of them.