If you enjoy the forum please consider supporting it by signing up for a NES Membership The benefits pay for the membership many times over.
I put adhesive-backed moleskin on the back of all my CTAC's, cut to shape. It's totally comfortable and lasts -- one of my CTAC's has had the same moleskin on it for 3 years now, with no sign of wear.
Comp-tac recently came out with the minotaur that has all the benefits of the C-TAC combined with a leather backing.