After going through my last winter's bulk, which I didn't do much if any cardio during that time, I've deciding I'm going to do cardio twice a week whenever I bulk. I just think it's worthwhile for overall health even if you're not trying to lose weight.
If you're feeling like you're not lean enough right now, you could just do a short cut for about 8 weeks... That's what I did, and I feel better for having done it. If nothing else, it gave me the confidence to know I have the self control to lose fat and weight, as opposed to just gaining weight all the time.
Plus, about the gut thing or whatever, I kinda feel like that throughout the day, but it's just because I'm bloated with so much food and water... When I wake up first thing in the morning, it's fine.