I have HS50M and a HS10W which are OK, but somehow only OK to me. Great for mixing, but missing something if you play a Kemper through them.
I have Mackie MR8's which I think are better than the KRK's, but I haven't heard the larger Yamaha.
Point is, I think you should get an 8" cone solution for your monitors in any decision you make.
As an aside, I took one MR8 to a friends house to play the Kemper through and it shoot the walls and overpowered his monitors and can keep up with an amp to some extent. I was amazed at how much the bass stayed tight through such high decibels.
Active 8" Monitors.