Does the resetting and fixing for a period make this safer, or is it still doomed to margin call unless I use a square root or similar method to control even the step changes.
Unfortunately, I think so (underlined part).
If you cannot make friends with the square-root thing you can try to withdraw some of your profits regularly and calculate your new risk settings based on the new equity.
Likewise, you can decrease your risk settings when in DD, this should flatten out your DDs, but might reduce your profit.
However, if you keep doing this for a long time you might loose everything when caught in a huge DD, as the max DD increases over time.
