I would say shoe goo and lots of drywall tape in the front area, and make the rear body post holes elongated to account for the flex front to back, and maybe a tad wider for side to side but nothing insane.

I think doing that will help protect the body.

You could also see about gluing some lexan under neath too to strengthen the area.

I got a brand new body I am not painting because of this issue till I see more on how this body I have that is the beater holds up with more driving.