I have outfitted my CSM with my 72 needle cylinder and it's knitting quite well. It's not terribly happy with the large needles, so I went back to the original needles I had.
Size 13 mens
50 rows 1 x 1 rib
10 rows pre-heel
78 rows foot
Then I have this Men's 10.5 - need to make the match tonight:
leg: 50 rows 1x1 rib
pre-heel: 10 rows
foot: 68 rows
I have been adjusting the tension on the fly. The ribbing I tend to have about three thread showing, then adjust the tension down to one thread in the pre-heel/foot area. I'm trying to keep that area from flaring out too much.
I do love the mock fair-isle. I think it makes a pretty impressive sock.