Bulging Upper Abs After Mini Tummy Tuck

Liposuction will not likely solve your problem.
More likely is the fact that a mini tummy tuck only repairs the muscle below the belly button whereas the full tummy tuck repairs the muscle above and below the umbilicus.
The bulging you experience after a meal is due to the unrepaired muscles allowing the upper abdomen to distend whereas the lower abdomen remains restrained by the muscle repair.
It is possible that the lower abdominal repair may loosen and ease the difference. Alternatively, you may require tightening of the upper abodminal muscle separation. Liposuction will do little to relieve your symptoms.

When patients have redundant
abdominal wall tissue following pregnancy, they will usually require a full
abdominoplasty to correct the problem. 
Although most patients would prefer a lesser procedure very few are good
candidates for mini abdominoplasty.

Although you have recently had a
mini abdominoplasty your current problems suggest that a full abdominoplasty
may have been a better option for you. 
The fact that your lower abdomen is tight and there is an upper
abdominal bulge suggest that you have excess upper abdominal skin and weak
upper abdominal muscles.

These problems would have been
addressed with a full abdominoplasty. 
This procedure would remove any excess skin and tighten the muscles of
the upper abdomen.  Liposuction
would most likely have no impact on your current problems.

It’s important that you discuss
this issue with your plastic surgeon. 
Correction of your problem will most likely require conversion of your
mini abdominoplasty to a full abdominoplasty with umbilical
transposition. 

Thank you for the question.

What you are describing is one of the problems they can be seen after the mini tummy tuck procedure is performed.

In my opinion, the mini tummy talk is an  operation that  produces very limited results and is very rarely indicated. It involves a shorter incision but does not address the majority of the abdominal wall issues present for most patients who present consultation. For example, the area of skin excised is quite small. The abdominal wall musculature is addressed below the umbilicus leaving the upper number wall potentially lax. The appearance of the umbilicus is not necessarily addressed sufficiently.
For most patients who have had pregnancies and/or weight loss a full abdominoplasty is necessary to achieve the desired results. Of course, there are downsides (including a longer scar and probably a longer recovery time) but for most patients the benefits outweigh the downsides. It is not unusual to see patients who've had mini tummy tuck  surgery present for  revisionary surgery.
It is important to work with a well experienced board-certified plastic surgeon to obtain advice (based on good ethics and judgment) to  improve your chances of a successful outcome and minimize the need for further surgery.
I hope this helps.