Iunno about the AOTC teal tint, but I’ve become convinced that the ESB blue tint on Hoth was deliberately added by GL to try to capture the color scheme of the Ralph McQuarrie concept paintings.
Same idea with zooming in slightly on all the ESB Falcon cockpit footage - retroactively correcting the “mistake” of building the set slightly bigger than in SW 1977 to accommodate the actors better.
Some changes to SW really are attempts to capture what Lucas “really wanted” way back when. Doesn’t make them good.
ANH on BD looks terrible color wise, but I think ESB looks great. My only frame of reference is the old unaltered VHS, and color wise, it looks much closer to it’s VHS than ANH from VHS to BD.
Of course, the VHS colors are probably very far from accurate.