Firstly, I would suggest that really only you can tell if these CC items will have any effect. By all means, try removing or changing them, and see (hear) what happens. You will NOT harm anything.
Do note that the drum channel (10) will be playing a number of different sounds, for different percussion instruments. For many of these, pitch bend sensitivity may well be totally irrelevant, so these controls will have zero effect. For some other instruments, there may be a small effect that may not be noticeable. Certain instruments, with more pitch parameter, may receive clear influence. The manuals for your units, regarding editing the percussion sounds, may give hints as to which specific sounds might be affected.
You do not suggest that these codes are ALWAYS inserted, you DO suggest that the codes are not always the same.. What is the difference between the music to be played between the times CC6 is 2 and the times it's 12. Are different drum kits selected? Ditto regarding when such codes are there, and not there?
These are very specific codes, and seem to have a specific purpose. They do not seem to be random. I would be more interested in trying to determine WHY they're there, rather than removing them when they do no harm.