18% protein is really high. I know some people use 17% for Flemish and angoras. I don't breed and haven't used it, but since too much protein can cause cecal issues and poor quality fur, I would be wary.
Do you know what the other nutrient percentages are? Fiber should be at least 18% although sometimes that's hard to find in alfalfa pellets.
I do know some people use Big Red and like it, but I'm not familiar with the brand myself. Out of curiosity, what other brands are available to you locally? PenPals, Purina, Blue Seal, and Manna Pro are all popular brands.