We are aware of the poor write up on RC Lab 30, but it was recommended, and we decided to buy it before we knew about it's rating.
We are going to gradually switch to Innova dry food for his next bag which has a good review. Hopefully Solo takes well to it. Surprisingly it's also cheaper than RC which proves price isn't everything, and you DON'T always get what you pay for.
Thanks for the chicken recommendation, I will definitely consider it.