Your last two statements might be confusing to some. I interpreted it as you agreeing with me that a juvenile should eat more than once a week at 6" and that once a week is for more mature fish.For some reason, I think David is talking about a TSN and not a tig. I may be wrong.
But I agree with feeding once a week at 6" or a bit over. That's more suitable for catfish over 1.5'-2'.