I decided to give another whack at trying to keep the pad in place in my warbonnet, so I borrowed my lovely girlfriend's REI Polarpod sleeping bag. The handy thing about these bags is: they have a couple of small loops on the outside, to which you can attach some elastic straps which are wrapped around your sleeping pad.
I found this to be a lot more convenient than putting the pad inside the pad slot. It was a lot easier to shift the pad around for the best comfort, and once I got it positioned, the straps did a good job of keeping the pad in place.
If you're having trouble keeping a pad in place in your blackbird, I recommend taking it OUT of the pad slot and just laying it inside the hammock, potentially with some sort of straps to keep the sucker underneath you.
I'm anxious to get a real night hanging outside to try this out for real.
A brand spankin new pair of Downmat 7's will be here on Monday (thanks hypnotoad!) and all I'm waiting for is the second Blackbird so we can head out into the woods and do some more hangin' Camping trips seem far less likely until the second Blackbird arrives - the girlfriend now refuses to sleep on the ground since trying my hammock