That MMPro has got to go! Unless you are geared super low (35mph or less) that is too much load.
Ofna front buggy shocks are the most popular 4 shock upgrade.
Traxxas "Big Bore" shocks work well, all 8 for about $65.
My main concern would be diffs and tranny gears, that power will rip through them in no time.
Thanks for sharing your G-Maxx. I love me some Maxx trucks!