I had daughter in enfamil Gentlease and she was the same way! She constantly fidgeted and made noises while eating actung uncomfy, also had trouble burping and passing gas.I then tried gerber soothe which she did better on, was able to pass gas and was generally quieter after two weeks, although it did constipate her at first, but one store carries it here and they were out of stock and I was three bottles from being out of formula so now we are going to try Gerber gentle. Everything is about the same on the label minus one ingredient.
Hopefully you can find a formula that works for them. Is it insane of me to suggest using different formulas on them. I have no experience with twins but maybe they just both aren't going to like the same formulas in the long run?