Most of these edits you're making look good to me and seem to make sense relative to the universal agreement of what the road classification hierarchy is used for. I would make a quick note for future reference about tertiary roads:

Most roads that lead to a dead end or closely parallel other tertiary roads probably shouldn't be tertiary- however- roads that loop back to themselves or are planned to be extended in the future as well as frontage roads or minor roads that are or are part of an alternative route to nearby major roads might also meet such criteria, but it really comes down to the specific road.

Anyways, I do thank you for helping out with working on some of these roads around here and the input you've given!