I have some data which I think you'll find interesting regarding the regressions of the new average slopes against singleton lengths(these are the same kind of regression for which I exhibited an S/C split in a CI plot several posts ago.)
But I don't want to sling these data at you if you're busy thinking other thoughts, so I won't post until you tell me it's OK.
Also - quick related question ... can I operate on the special covs as I've done for the average slopes, i.e. regress them om lengths. Or are they a different kind of animal?