I've also seen the suggestion (Nia Shanks, I think?) to start on your stronger side and do your goal number of reps, and then do that many reps on your weaker side, putting in a brief pause (say 5-10 seconds) at some point if you have to. (For example if I do 8 reps on my strong side I'd do as many as I can (let's say 6) put the weight down for a few seconds, and then pick it up again and do the last 2 reps.) My rule is that I can't move up in weight until I can do my goal number of reps on both sides without a pause.

But basically the way to not make the imbalance worse is to make sure you're not doing extra reps/time on your stronger side; either keep it the same or favor the weaker one until it catches up.