I'm also having this issue where my left side has much more supply. I'm trying to intentionally start feeding DD on my right side each time (when she's most hungry / gets the most) to try and build up this side. Hope this might work?? Pumping on your weaker side, like PP said, might be a great idea, too.
I have that issue but we power through, she doesn't like the left side she can't hold it for long she sucks a little lets go then latches again but i feed her from it anyway but i have to admit that i cheat and let her feed from the right few times in a row when i'm sleeping lol
Re: Breastfeeding Help