I wouldn't even entertain the thought of adding test. Mk just doesn't make sense. If you think you look fat now, it isn't going to get better with MK added thats for sure. But it will definitely help with sleep, increasing hunger and packing on muscle in the long haul.

If I gained 40lbs of fat and was in your situation, the 3/4 compounds I would consider would be T3 or T4, clen and HGH. If running something like T3 and clen I think then MK wouldn't be too bad of an idea but I just think the water weight gain might make matters worse if you already are feeling fat.