I asked about the bubble in this thread...
https://www.hammockforums.net/forum/...ng-Tarp-Bubble
I ended up figuring out how to roll the tarp and slide the skin over it to avoid the bubble and still use the double skins. I think the longer single skin would be more of a pain for me. I like that I can have smaller tapered skins that fit nicely in the outside pocket on my pack without a compression sack. A single would need to be more straight than tapered to get over the thicker center of the tarp. I also like only dealing with half of the tarp at a time. More so when putting it away than deploying.
Personal preference.