I'd rather use 2% per trade. There's less stress because there's no risk of blowing up the account. One of my favorite things about FMT is the risk:reward. 50:1 leverage is fine if you have realistic money management.
For other reasons though I am looking into at least 1 offshore broker that will accept US citizens and offers 100:1.
Even offshore brokers must hold accounts for US residents in the US and you will need to provide proof of residence if you wish to trade outside of the US. Those US traders who currently use offshore will have their accounts moved.