Disliked{quote} Yes, I wish this would be only theoretical question for you So I understood once you reach a new round level then the approach is to keep related position size till the next round level above or below. E.g. once 120 reached then you keep 1.2 till either 110 or 130 and then change it accordingly.Ignored
Yes, exactly that. What's important is not the absolute precision of it all - I've mentioned before that trading is not rocket science - but just to know you have robust risk control that will keep your losses small, come what may.
Over precision is a little pointless anyway here as things like price slippage on executuion will always mean you can't be decimal place perfect; and many contracts have discrete step sizes in allowable position size so you can only be approximating at best.