Well some record may have been set here - your group may be 1 or 2 out
of several hundred thousand, that would chose them Pioneer speakers over
the Definitive.
I am not really concerned about level matching - I want a speaker to sound
good at all levels. Also, a bi-polar will (radiate) sound different than a direct
radiating speaker.
I would not hook a different speaker between the left and right side.
Clear your mind and focus a little more - then play one set at a time - play 5
or 6 songs and take notes with one set of speakers. Then repeat with the other
set. Then see how it turns out.
Also, give it a few days - your mind may or may not change.
With all that said, while I for the most part, do not prefer bi-polar speakers for
music, I will take them over those Pioneer speakers.
However, it is what floats your boat.
Enjoy the adventure.