Yep, the frozen fruit makes it more fluffy for sure as it helps to keep it thick. Sounds like you used too much liquid maybe?
Or the casein you used isn't the biz. Is it a new one you haven't used before? They are not all created equal.
unless you also blended the mix first for too long before whisking it?
this is true, the right amount is crucial and you can definitely add but not take away.
Im using the same casien, First day i got it i made it and it fluffed up like egg whites.
Tried the same last night minus the forzen fruit and nothing,
Tried twice with whisker, and twice with a beater.
When i used the 1/4 cup of liquid to the 1 scoop of powder, It went to a dough consistancy like i was making bread, So i had to add a splash of milk. Then it jsut sludges and stays the same.
I will try again with the frozen fruit, As thats the only diffrent thing i didnet do last night,