Lower protein is certainly therefore appropriate, but importantly, high-quality rather than
low-quality
protein is just as important. That means either a good quality kd dog food (canned) or human grade meats and poultry.
Even more important is the phosphorus content of food. Phosphorus must be severely restricted, so make yourself aware of what is in the foods you are feeding. You didn't mention phosphorus in the bloodwork - has this test been done? If so, what is the reading?