Formula for reflux?

Has anyone's baby gone on Elecare/PurAmino exclusively for reflux? We are having such a hard time finding a formula our baby tolerates. She was on Neuropro for 2 months with bad reflux. Doctor switched her to Nutramigen and 3 weeks later she had blood in her stools and even though was eating the same amount, gained exactly 1 ounce during that time. We went back to Neuropro and she has started with the reflux again but did gain 8 ounces in a week. Gripe water and thickening with cereal isn't helping either.