Dealing with the same thing atm. You want to use dbs to bring up the weak side. You don't want to do more reps with the stronger side so let the weaker side determine the number of reps. If your weaker side fails at 6 reps, you don't want to do 8 with the strong side even if you have more reps in the tank..
Do more sets with the weaker side which will give more stimulus for growth. This is controversial because some ppl think you should do do the same volume on both sides but let the number of reps be determined by technical failure of the weaker side. But I don't agree with this - what's the danger, that the weak side will become too strong? If that even happens then that's a great thing given then the original problem.
My strategy is also heading towards doing no barbell work because bilateral exercises just seem to make the imbalance worse. Alternatively if you want to keep doing bilateral work for some reason, i'd take some weight off until you can do it symmetrically. But why bother, you can do db bench press, db ohp - nothing special about barbells, and if you do barbell presses with significant muscle & strength imbalances you're just going to get injured (happened to me recently doing ohp).
