I don't think that you're OOC, but I feel that you are very, very insular with Zuko and who you choose to thread with -- namely, basically only the Avatar cast. I've gathered some examples:

Oct AC - with Aang only
Jan AC - with castmates only
Bonfire log threads with Wan, Aang, and Sokka. In fact the only people who weren't castmates who were tagged in the Bonfire log were NPCs, and one thread with Aya.

Landfall log - thread with Sokka, thread with Wan, no other tag ins there.
Race log - thread with Iroh, thread with Wan, thread with Sokka, no other tag ins in that log either.

I've noted you sometimes express that you're worried about making AC, and I really think you could benefit in that regard by tagging non-Avatar characters sometimes.