Everyone seems to think you need to lighten weight and do tons of reps to cut up. Most will agree, that to maintain a certain level of muscle mass and density, you should continue to lift in the same manner that produced those muscles. Yes you can switch it up occasionally and throw in some high rep sets, but I think you should continue to lift heavy and lower rest time between sets. Stay in 6-8 rep range. Yes, your strength might go down a bit on lower calories as a result, but you are still taxing your muscles by staying heavy. Stick with the heavy weight, maybe take a week off before you really start up, and lower rest periods between sets. Your workout time will go down so you can throw in 20 min of HIIT after lifting. Start there, and see how things go, then maybe add in a couple AM sessions of cardio.