My two first-year hives are light, and I'm feeding sugar. Today, I also fed a cup or two of protein powder. Not sure if this was a good idea or not?

I just got my order from Mann Lake and I also bought a jug of pro health since it was on sale. I am just wondering if I should feed it now or wait till I make splits. Also what is the benefit of this solution? Is 1:1 or 2:1 syrup just as good? :s:s:s:s