ok, well not sure that number of turns is the best, seeing as you can beat some (all?) levels in zero turns :)
But since we are flexing, I have 4 levels with 0 turns wins :D You can see them on my profile.*
A different approach: Won in 0 turns
Feeling Blue: Won in 0 turns
Stuck together: Won in 0 turns
Three blind mice: Won in 0 turns
EDIT: In case you want some lower targets, you can see the records for the OG levels here : https://www.warzone.com/SinglePlayer/allbuiltin
At least some of your earlier gold wins can be improved by a few turns. No clue about the later levels, as I haven't completed SP. For which you have my respect.
*Some of them were not even gold, but warzone just record it as a zero turn win, thus giving gold as well. Not hax, just bug.
Edited 1/16/2020 10:10:34