Do you have fast/overactive letdown or an over supply?

Jaime • Had our boy/girl twins at 35 weeks on September 30th. They are healthy and perfect!!!
Hi my lovely ladies! I began pumping at the birth of my B/G twins. They were in the NICU for one week due to premature birth. They were not strong enough to breastfeed until 6 weeks old. I have been religiously pumping every 3 hours to drain my breasts after they BF. I have a crazy over-supply problem (donating to milk bank). I guess I just kept doing it b/c I was told to pump every 3 hours. But, I think my twins are getting frustrated by an overactive/forceful letdown. Any suggestions to help the babies and strategy to decrease my supply? Should I just pump less and less? Can I increase my supply if I need to in the future? I've been nursing them in a reclined position and that helps. Any other ideas would be greatly appreciated!  Here's a pic of my cuties just for fun !