Think of the Required capital as the largest historical drawdown, because that is what it is. Then ask yourself how much pain am I willing to experience as I go through this drawdown again. And worse, since statistically, a larger drawdown is in the future.

Let's say you are will thing to sit through a 20% draw down. Then if $5400 is 20% of your account, then you need to deposit $27,000.

So now you can take the annual return amount from your backtest and divide that by $27,000 to get your roughly calculated real ROI. Just think about that a little.

Just take some time to understand what Required Capital (aka maximum drawdown) is and how that affects you risk profile and drawdown tolerance.