Hi spacemantan,
With just one engine out, the aircraft must be able to GA from DA with a certain minimum gradient (2.5%?)
With 2 engines out, it probably won't climb at that minimum gradient. One way around this is to raise your commit altitude to a higher point where if you you decide to GA, you may continue down the ILS glide, and whilst you accelerate, raise the gear and flaps until the aircraft is configured as required (clean on TriStar), then climb away before reaching your DA. You'll achieve a much better gradient.