I'm assuming that you trade only the US market, because aren't margin requirements for the ES around $5K outside normal hours?
If so, why not consider using the SSO/SDS combination to approximate the ES contract? This way you can trade real time with a position size that is scaled to your account?
IB commissions wouldn't make a huge dent if you switched to unbundled, and since you moved from IB to AMP, I'm assuming they have a similar (or better) commission schedule.
My $0.02.