If you trade full time, won't the profits from your trading be considered as taxable income (ie trading is your full time job) and the capital gains rule should not apply? That applies to a couple of people I know.
For FX discretionary trading are you more of a fundamental trader or are you based more on trend following?
Different jurisdictions have different tax rules. Plenty have reductions or exemptions for worldwide income, some have no income tax at all.