ok here's the thing. Vets are not nutritionists. They are vets.
There is no need to feed any extra protein if your feeding a quality hpw consistently. There is already enough protein IN the hpw. By feeding extra protein with the diet, you are changing the whole diet and making it un balanced.
To much protein can be as bad as not enough, same with calcium.
There are times where I'll feed chicken on cheat nights. IF I run out of their staple I will feed a protein, fruit and veg. Once I make a new batch of staple, they get staple fruit and veg no other protein source.
IF Hpw needed added protein to make it balanced it would be included in the recipe but it is not.
Now let me ask you, what hpw are you using? They aren't all the same and some are NOT good quality.
exotic nutrition hpw? Critter Love Hpw?