I agree with the cold milk, mix it warm and let it cool, and I don't feed late at night as it just sits. We lost a lamb to bloat 3 weeks ago, very distressing. Its sister fell ill a week later even though giving smaller amounts and not feeding last thing. Managed to treat her with a small amount of bicarb in 10Ml of water. I kept her walking round and it quickly passed, despite her blowing up like a football.
All I can suggest is watch mixing ratios of milk powder , mix warm, feed cold. Small regular feeds, and no large feeds late at night.