Call lactation at the hospital. I breastfed my twins for 15 months with absolutely no supplementation (I also went back to work full-time when they were only eight weeks old). I don't know about the imbalance, but I always nursed the same twin on the same side. My body adapted for each baby's needs. Once, we goofed and accidentally switched sides. I guess my son had a more powerful suck than his brother because his brother was choking when the milk was coming out too fast.
For now, as painful as it sounds, try feeding them a little early for each feeding. Maybe they can get more milk that way. Also, if you pump after each feeding (like you'll have time for that!), you might be able to get out some hind milk, which will then increase the demand for it the next time they eat.
I would be more than happy to give more advice and encouragement. Show your husband the cost of formula until a baby turns one, then multiply by two! I'm sure he'll be willing to try longer. You can do it!!