Campwell 30 Sleeping Bag

The REI brand ones are nice (and true to the temps they say they are good for). I have an REI three season single, and have used it to just below freezing with no problems.

My summer REI bag, which is 30 degrees (close to yours) doesn't have much fluff either. I've never actually expected the bag to have loft, because there's so little down. My winter bag from Mountain hardware does puff up, but there's probably 3x as much down in there and it's better down. I don't think your problem was the bag unless you left it in a compression sack for an extended period of time. Or just washed it and it's all clumped up. I can sleep out in 5C/40F degrees in the Sierra Nevada no problem with my summer bag, so i'm not sure why you had so many problems with all that clothing on. I will say 3R is pretty low, a good mat helps a lot.