I have to agree that mixing amps is not a good idea, its a nice idea and kind of tantalizing to fantasize about.
If your dead set on this approach then I would at least stay with Mac equipment. Better chances of getting them to match.
My system is tri-amped, lots and lots of wires, I went with ARC pre and Pass amps. Also using an outboard electronic x-over. BTW I've been through three sets of amps to get where I'm at (took about 35 years!).
I am not familiar with all the Shitt equipment and their silly names, but they do make an equalizer that several people in the forum use to excellent success.
Good luck in your quest.
Regards,
barts