breastfeeding question

My son will be 8 weeks on Sunday & preferred my right breast over my left until about a week or 2 ago so the right makes a lot more than my left making my right double the size of the left. When pumping I can only get about an once from my left & anywhere from 3.5-7.5 ounces from my right depending on how long it's been since he's eaten or I've pumped. I have to go back to work Monday so I've been trying to pump more to get a stash for my mom since she will be the one watching him. Now I start him on the left & after about 20 minutes I'll switch him to the right & he typically eats every 2 hours. Is there a way to get the left to produce more than the ounce it's producing?