Thanks again Thirstywolf!

I'm still struggling to understand, so please bear with me...

Re. Margin, how are you choosing the value(s) to use? Using Zorro's Test? Some other calculation/heuristic? Or simply "gut feel"?

Re. the key, if it's not Margin, I assume you mean the choice of broker as mentioned above? From the closed trades, IC Markets takes 21% of your profit - is that way lower than other brokers you've experienced? Or are they better for other reasons?

Thanks.