The Hla Oad Smuggler quest is just fixing a hole in vanilla about Hrondar Highlander being openly a smuggler but not tied to any quests or proper content, the Grytewake thing is my explanation but that's part of a Hlaalu quest.

And just for reference, there's nothing to do in Gnaar Mok, the Ward Listing just lists every location being taxed in the mod's lore. You generally want to go to the first location listed under each ward (usually the settlement the ward is named after) and visit the Census and Excise offices there. For the optional quests, ask each of the main office questgivers about "local representatives" if available. Sorry if it's confusing! And thank you for sticking with the mod for 30 episodes, wow :D