Lazy side

I'm pregnant again with my second. Successfully breastfed the 1st but my left size was always kind of behind in production. My right side in contrast was an overproducer with a strong letdown. I learned to accommodate for the strong let down but not my under productive side. This led to back problems due to size difference and time spent on each side.

Does anyone have any tips for evening out a lazy side? I don't really mind as my baby was always fed I would love to avoid the headaches and back aches from the favoritism though.