Yesterday, I try a new setup of my MR03(wide) with PN 90mm motormount, I put a 911 GT1 body on it and powered by a PN 39 turns motor. After several runs with very little changes in setting, it was fast and stable. I will put a handwind motor into it next time.
If you want to play short wheelbase car, the best way is to go with either Atomic or PN motormount, some of these motormounts are mid-motor mounts and can allow you set up 90mm or 94 mm wheelbase. I have a MR03 with PN 90mm motormount, powered by an Atomic AD stork motor which is pretty fast and is fun to drive and is fun to be watched.