How long have you been down to 1700 calories? If you’ve been there for a bit then you might not jump to 2200 calories right away.
I’m currently cutting some excess body fat before I go into a very, very, very slow gaining phase. Once I’m happy with my body fat then I only intend to add 50-100 calories per day and then slowly increase from there. I see no reason to rush. It will only make me fat again.
I’m guessing you’re saying you have a gut because you can’t see your abs. I do weighted crunches and treat my abs like any other muscle. I use heavy weight and do sets off 10-12 reps. The idea is to get them to hypertrophy which will make them appear more defined.
Don’t do it with obliques, though. They’ll grow but you end up looking wider and getting a rectangle physique.