I don't know what the michi is like at the low end - hopefully a little better than the rotel 971 which begins rolling off at 120Hz and can thus sound rather lean.
The Kestrels can go surprisingly deep for a speaker of their size, and they thrive on powerful, punchy amplifiers.
In your position I'd think about keeping the RC995, and get a pair of NAD C272s if you can find them. Use the bridging cables you have with the 272s, and you will have an extremely nice power amp setup for the kestrels. Maybe later on look at alternate preamps, although I'd have reservations over trying to drive the cable length for monos from a passive.
I variously ran my kestrels with an RA-971, RA-971 + RB-971 (biamped, made no difference to sound) and the NAD S300. The S300 went very nicely with them.