I'd use something else for the spinning weapon on the VS you have. Maybe use something such as a bar spinner with sledgehammers, as that can hit hard and last for a while. I would also add stabilisers to avoid your first 'bot from toppling over on high-speed turns.
Also, work to the weight limit. Your VS is anorexic for a heavyweight, maybe use the weight on heavy plows or something similar to that.
I don't know what to say about the HS other than what Naryar said about making it realistic. (Mostly because I have yet to make a HS.)