Last year I lost about 12 kg after going on a bulk and putting on way too much fat. Now I'm bulking again, but trying to be smarter about it, eating mainly clean foods. One month in and I'm up 3 kg and about an inch on the waist (I'm at about 33.25). Now I think I'm gaining a little fast. An inch on the waist per 3kg. Now I don't give a shit about abs but I don't want my gut to blow out to the 39" I was before I lost the weight, when I was snoring my head off and couldn't even stretch properly because of my gut.

What do you think is an acceptable gain on the waist per kg ?