Hi Chris,
I am a little unsure if your question is about feeding feeders high levels of animal protein, or feeding herps high amounts of animal protein directly.
Can you clarify?
I look at protein as a chain of individual amino acids, and there are several notable differences between animal proteins and plant proteins.
First, is the balance. but the differences from one animal protein source to another can have a completely different amino acid profile. The same thing happens when we compare various plant proteins together.
We also have important amino acids such as Taurine, which are called "free amino acids" meaning they do not get stuck in the protein chain.
I think it is important we understand the difference between amino acids and protein while we are on the subject.
As I understand it, the body has an attraction to some amino acids over others.... but a protein is a chain of amino acids linked together, so the body can't take in one amino acid without sucking in the whole chain. If we provide the body with all the amino acids it needs in free forms, the body will suck up all the ones it likes best and leave the others on the table, even though they are essential...... Kind of like a kid at a table full of candy and broccoli
So most of our amino acids come as protein, but some like Taurine, are "free" and not bound to a protein chain.
Anyways, I am off track a bit. What I am getting at is when you break it down, plant and animal proteins both contain the same essential amino acids, but they are bound together in different balances. So for me, the difference between plant protein and animal protein is looked at as how differently are these amino acids balanced.
Another significant difference between plant and animal protein is that plant proteins can contain inhibitors such as those found in Soy, which actually can prevent absorption of certain amino acids in the chain (trypsin inhibitor for example)
I think that more important than the source of protein is the total combined amino acid profile. For example, I use whey protein in my gecko diet and it is considered the gold standard as far as bio availability.... compared to egg.... but again, there are even more differences in how quickly a body can break down certain proteins and utilize them.....
You can combine a blend of pea protein and rice protein and get an amino acid profile darn near as good as Whey protein, but from a plant source...
Taurine, as I mentioned, is a free amino acid not found in plant protein and it is a REALLY important amino acid for carnivores and Insectivores (it also is found in insects). This, and Retinol, are the two reasons you can't feed cats a Vegan diet.
Anyways, I think I had too much caffeine this morning because I am not sure I even answered your question LOL.
In a nutshell, I think that hydration and temperature are probably more important than protein type....... but animals protein sources also bring in other nutrients to the picture, such as lots of lipids, which could have their own effects. I personally think, the AMOUNT of protein is more important than whether it is of plant or animal origin. Who knows, it may come down to High protein levels in insect diet and the Uric Acid content of our feeders fed a high protein diet that is the most responsible for occurrences of gout....
Not knowing for sure, I think as you point out, a good balance is probably the best approach.
As far as feeding insects goes, I think the real issue is the amount of protein in the diet, and not the source, but adding any animal protein will quickly get us up to levels that I don't think are good at this point. I don't see any logical reason to have animal protein in an insect diet when we only need 12% or so.
Allen
Unless you are experiencing issues of Gout in your herps, it probably isn't important at all, but might be worth making the adjustment to a lower protein feed for insurance purposes. 
