>>This is the big tradeoff with bug protection in a shaped tarp: if it's calm enough that the bugs are out, you need your vents working. And if it's windy enough to seal the shelter tight to the ground, there won't be any bugs out!
This has also been my experience. Lately, for a number of reasons, I've been gravitating back to my shaped tarp, the silshelter. But in heavy mosquito country, you have to bring some kind of netting. In my case, it's the A16 bug bivy. Tarptents are great when the mosquitoes are heavy, but they tent to let the cold winds in as well.