I have had many different abdominal and pubic surgeries over time since the 1960s (appendectomy, inguinal hernia, laperotomy'/spleenectomy, incisional hernia repair with retention sutures [most warping of the terrain], and now open ventral-pubic prostatectomy).
This is to say I have some experience in the rehabilitation of scar tissue in the area.
I also love food and I am always fighting the "battle of the bulge."
Old scars and adipose tissue seem eager to betray my lack of discipline.
Fat tissue is so unforgiving that your best bet is to try to lose it!
In addition to dietieng and exercise (I still vote for speed-walking) - in addition to these normal responses to that "extra belt" I seem to fight more and more as the years go by -
I also massage the area of the scar tissue.
I especially massage the actual scars - sort of a pinching move in the direction of closure.
I have found that working on various core/trunk muscle groups with aerobic routines also helps shape the distended muscles and fat.
I'm not suggesting achieving the "six-pack" but perhaps avoiding the "keg!"