You just stated that the chins aren't afffecting your growth or recovery, and that you are not doing them to failure, like the program calls for. Are you growing or not? The program only works when followed properly.
Please restate your problem. I'm confused now.
Maybe less frequency at a higher intensity would help. Switching from a high volume program to a low to medium volume/high intensity program (novice) can induce muscle growth quite nicely.
Either that, or ditch the novice program.
At any rate, some people find that particular body parts grow faster than others... I'd be suspect if you aren't following the routine though. Submax chins 3 times a week aren't as effective as maximal chins 1-2 times per week.