Here we go
https://www.bikeforums.net/bicycle-m...o-fd-m591.html
Post 11 talks about how modern MTB FDs are made for 12 tooth jumps and may not work right with a triple with 10 tooth jumps. Some of the reviews of the Deore FD on Amazon make the same point.
So this may be a different reason to stick with a bottom pull road type FD on this set up as I'm running 46/36/26 rings.