To see if my recent activity has had any impact, I decided to rerecord XXVI, which I last looked at back in January. First time through was terrible, was probably as bad as it used to be. This is attempt #3:
XXVI-2010-10-04 by TFox17
And the old one, now copied onto Soundcloud:
XXVI-2010-01-31 by TFox17
Listening critically, I think my tone is not as much improved as I'd hoped, but maybe it's going in the right direction.