Kustom Groove & 3 8-ohm cabs

I've been investigating the Kustom Groovebass lately. According to the specs, it can handle a minimum load of 2-ohms. In a little spreadsheet in the manual, it shows that it's fine to run it with 3 8-ohm cabs at around 2.67 ohms.

What I am curious about is if I could run a 3rd cabinet (usually use two) as an excellent bass monitor for the drummer. This town is really short on venues with excellent monitor systems (that run bass), and it could be a convenient setup. In this hypothetical scenario, I would set it up like this-

Output A: Goliath III -> Avatar 2x10pro
Output B: Powerhouse
(output A and B are in parallel)

If I did it this way, would it lower a little bit of the power to the Goliath and cut the volume of it any (this would be a good thing, because I prefer the Powerhouse tone)? Or would it be basically an even output along each cab?

 

Thanks Clap. I dont know what I'd do without the TB community.