In the past few months, I've managed to trim down to about 11% bodyfat but unfortunately not without sacrificing a several pounds of muscle in the process. I'd like to regain and build beyond that lost size. If I could gradually reduce my bodyfat further as well, that'd be great, but muscle gain without increasing fat is my goal right now.
"Everyone's body is different" notwithstanding, how would I go about calculating a good guideline for daily caloric intake and macronutrient split that would best facilitate gaining of muscle without increase of fat?