“Eeeh” or “meh” would indeed signal mild disagreement, but it’s stronger.

I’d say there is a slight inflection to the “uh-huh”/“sure” (almost a low-tone questinging iflextion?) to indicate less-than-full-throated-agreement, but that’s difficult to convey in writing.

which are you saying is "more negative" eeeh or uh-huh? The way I hear it, eeeh is much more rude or insulting, but also has more levity. Uh-huh is a mild eye roll sarcasm meant as an insult, more to the side of someones back. Eeeehhh, is "pretty sure you are wrong" to their face.