More weight would definitely be a start but you obviously have to watch your weight distribution as Hatchet proved this year, the wheels were up front and the scooter motor, batteries, esc's and axe head were all at the back of what was really a very squat chassis, even the 2kg scoop from Hardwired wasn't enough to tip the machines weight forward. In short trying to make Hatchet as compact as possible hindered it's overall freedom of movement which is why i'm going for something more like thor which is longer towards to back for better weight distribution, with Hardwired though you shouldn't have too much of a problem because of the size of it but obviously trying to add 3 - 4 kg of weight to something so small is difficult.