I am so glad to hear that they are doing well, that's awesome. Our littlest one had a PDA and a very very slight murmur, nothing that needed any intervention. He just had his one-year checkup with the cardiologist and both are gone. So I hope it's the same for yours.
As for the bottle feeds, mine were released at 35w2d and 36w3d, once they took all feedings by bottle for 4 or 5 days in a row. It sounds like your girls are getting really close. They will probably be there within a week. For having been born quite a lot earlier than mine, they are doing phantastic!
Petra
DS 08/02
DD 05/04
BBG 05/09 32.1 weeks