All US Modern Coins - Like Or No Like Toning

All things being equal, I prefer toning (in general) on Eisenhower dollars, and Kennedy half dollars.

Up to a point, the richer the toning, the better.

Also any toning needs to be very even from top to bottom, and right to left. I do not like blotchy toning.

I will add a question to your thoughts. Why is my Eisenhower 1976 coins toned more on the reverse, than the obverse?

One more question. Does toning hurt the slabbed grading?

Thanks for any opinions.