What method of increasing bet size depending on the realised PnL would you suggest? For instance, assuming your starting risk per trade is $150, after PnL reaches 4 x basic risk per trade (i.e. $600), in next trade you can risk half of the PnL i.e. $300. Then, as long as PnL stays above $600, you always risk 50% of the realised PnL. So, if PnL is $1,000 you risk $500 and so on. Does it make sense?