I'll keep your technique in mind, thanks. When I tuned my PM6A and resin-coated-CF 6.5" subs at ~100hz, I was VERY near-field and used a big plate amp with continuous phase-knob to dial in the "fullest" sound (repeatably and fairly apparent). My Jamo 8" subs for Monitor Audio Studio 2 (liter) worked the same, once I flipped them to face front. Adding (super-) tweeter also, move it until XO tone sounds fullest/loudest, should be in-phase.
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The best way to do this would be to mic up what is happening with REW with a sub on its own, each speaker on their own and overlay in REW to assess the response and alignment. I actually think running in parallel is often better was you avoid the need to DSP or tweak your full range and if you can DSP the subs and EQ, align even better. If not its the manual sub adjustments to get as good a result as possible. a lot of 'slam' and 'drive' is form cone area and removing your mains from supporting this might not provide the best results