I have 2 months of positive expectancy on SIM, discretionary trading so I haven't back tested/forward tested.
The "positive expectancy" is irrelevant. Unless and until you test your hypotheses thoroughly, backward and forward, then determine whether or not the plan is consistently profitable, you'll never be able to trust it, and if you can't trust it, you'll never be able to find the discipline to trade it, and absent all that, you'll never be able to trade size.