i don't think doubling your positions would be the best way to go about increasing your position size..
imagine that, one day you're trading 4 contracts, and the next day, wham, 8. good for you if he have a good day, but, and i'm talking from experience here (stocks, not futures), if you hit a drawdown at the same time as you increased your position size it can be really painful; psychologically more than anything.
that's one of the biggest problems, imo, that the small futures trader faces: increasing size from 1 lots to 2 contracts, because he's just doubled his position size.
imagine that, one day you're trading 4 contracts, and the next day, wham, 8. good for you if he have a good day, but, and i'm talking from experience here (stocks, not futures), if you hit a drawdown at the same time as you increased your position size it can be really painful; psychologically more than anything.
that's one of the biggest problems, imo, that the small futures trader faces: increasing size from 1 lots to 2 contracts, because he's just doubled his position size.
If your systems are simple enough, you can always do it, if not make them simpler.