I agree with Lori in that all shelters have some sort of tweaking that goes on as you learn about them. With hammocking the under insulation has been the thing that I've had to tweak the most. I would think site selection is pretty big in tweaking tent and tarp setups. You don't want slopes or areas that collect or funnel water.

I've had very little trouble getting a good hang out of my blackbird but it has a set ridgeline that makes it pretty easy.

KY Chris