Every time I've tried DEILD after a LD I've never made it back in. However a few nights ago I reentered a dream (non-lucidly, alas) for the first time. The big difference was the state of mind: I was lying quietly, including mentally quietly after the (very brief) LD, lightly thinking about the dream, and I just drifted off and re-entered the dream in a room to the side of where I got lucid. Normally I'm pretty stimulated after a LD, perhaps frustrated a bit at waking up. For me the key is basically staying quiet and staying asleep, and just drifting off again.

The big question then is how to get that pearl of awareness in there to arrive in the dream already lucid...I'll have to experiment.