bodybuilder gut

marc, i am on my second cycle.  half way in i have already put on another 10lbs.  the issue is that i seem to be developing that bodybuilder gut where the top part of my stomach barrels out a bit when i take deep breaths or don't posture.  i am not on HGH or insulin.  i am thinking it is from the massive increase in caloric intake.  am i not controlling portions well enough so my stomach is expanding each time i eat?  what do i do to take in the amount of calories necessary but not get this hard barrel upper stomach.  i still have abs, so it's so confusing!!