Not to mention - USA residents specifically are at a disadvantage when using the Z12 system:

• Lack of fundamental diversification. From the default Z12 asset list, only foreign exchange instruments are permitted, and not CFD's.
• Leverage is capped by law. (But if you're not really diversified, maybe this is a good thing.)

Globally, each broker has its own Forex and CFD contract specifications, as they are not exchange-traded. This necessarily means that results will vary.

Finally, you have the sequential consumption of margin issue as stated before, since this is not a portfolio rotation system.