So am I right in saying that to avoid the same issues that 540 had I would need to fit larger motors and then gear them down further OR use 1 motor per wheel as I do atm with conker. Both of these would ensure that I had more power to deal with the increased grip.

What motors did 540 use then I know that I need to go up from there or change the ratio, that thing was seriously fast so reigning in the speed would probably help