I've got a few for you.
First, try profiling one mic at a time. A trained ear can approximate how it will sound when combined (or simply reamp with both profiles and test it out for sure).If you feel you could use a hand with that, i'll gladly help.
As for multi-mic setups, do you have a sound-card with two inputs?
If so, just use something like Waves InPhase, Meldaproduction MAutoAlign or Soundradix Auto-Align. I might be able to help with these as well.
If you only have a mixer and no DAW, you should use the white noise trick, which i'm guessing is what FastRedPonyCar explained?
Thoroughly profiling an amp as diverse as the Quickrod is an undertaking, no doubt. You should narrow down some stuff as i believe you'll find that some settings might sound overly similar when recorded - but you can only find that out the hard way
I do believe it's worth it, though. For many, many reasons.
None of which have anything to do with the fact i *really* like Splawns and don't yet have a good Quickrod profile...
Anyway, if you need any help, give me a holler