Thanks Thirstywolf!

Let me say what I think I read/see, & you can correct where I go astray.

Zorro's Test facility allows determination of the maximum Margin setting at which it's "safe" to run a strategy with the given Capital. (There are other threads that try to talk about what exactly "safe" means... )

You're setting Margin higher than this "safe" value. This can give increased returns (as you've experienced! ) when the market goes the right way, but with higher risk. If the market went the other way, the increased Margin = more risk than the account can handle = margin call.

I gather that you're managing that increased risk by watching Zorro very closely, and intending to exit earlier than Zorro would if things go too bad too fast?

Or do you feel that the risk is overstated and it's OK to be aggressive with the Margin slider?

How are you determining what Margin values to use?

Thanks!