Many thanks for the suggestions. Lugia - I pulled the M32 out of the rack (as I mentioned I would do) and that obviously leaves a lot more room. I added Kinks, Wogglebug (which shows very well in the Make Noise demos of QPAS and Mimeophon). Plaits, Polaris, another Quad VCA, ES Disting Mk4, Pamela's New Workout and a Dixie II+.
There's still 32HP. Am I getting closer to ambient, self-generative bliss?
I just received the QPAS and Maths yesterday and holy crap that QPAS sounds incredible - and then when you modulate it - just wow! I do love the sound of the Erica Black VCO 2 and the QPAS makes it even better.
(the forum doesn't seem to update the rack here)