I refused to do cardio unless needed (trials for instance)
Doing cardio slows muscle growth as you're using the energy to recover from a run or something as well as repairing the muscles, I know its a negligable amount but it's enough. Think of it this way, the faster you grow muscle, the higher your resting metabolic rate, the more food you need to maintain, the easier it is to cut down.
Congrats on losing that much though! It's really impressive.