According to that thread it states that flaked rye doesn't contribute as many gravity points as malted rye... yet in programs like beer smith it has a higher OG - 1.029 for malted rye and 1.03-something for flaked. I'm just wondering who is correct on that subject..
Rye malt has higher level of beta-glucans making lautering much more problematic, even if you step mash with long beta-glucan rest in 116F. Flavor-wise, i did not notice much differences in beers with ~20% of each in grain bills.
My flaked rye has 81% of carbohydrates, so it's clearly much more than in rye malt, eg. the one from Steinbach Malzerei, which has yield of ~70%.