Quick calculation of mag differences:
Sirius A = -1.46m, B = 8.44m, delta = 9.9
Procyon A = 0.34m, B = 10.7m, delta = 10.36
Sirius A, Procyon A delta = 1.8m
Sirius B, Procyon B delta = 2.26m
I also did simulation with Aberrator (with turbulence) for 12" aperture f/10 (and 90% obstruction, to roughly match what I saw in eyepiece), see attached screen dump below.
I think I have to give up Procyon B - unless I climb some mountain (1000metres?) with the whole setup and try from there.
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