I do a lot of lightweight packing and I am starting to use the MSR E-wing tarp. I ripped my last tarp (not sure who made it tho) so I will let you know what I think after I test it out a few times in various conditions.
I use a lightweight tarp with an ENO hammock and bug net, leaving my tent and sleeping pad at home (if i am in an area with trees). I like the hammock as well bc it keeps me up off the ground so i dont worry about rain water running under me and getting me wet the way you do sleeping on the ground. They take a little longer to set up though which is a pain. just an alternative idea for you to consider
If a bivy is what you're looking for I know the O.R. alpine bivy is CRUCIAL! pricy but amazing. O.R. hasnt made a product I have not loved yet and that bivy is light and goretec so its built to last and be dry.
I had a question for you too, actually. I see you have been using the L.L. Bean microlight tent. What do you think about it? and would you recommend it? Pros? Cons? I know that it is not freestanding and I have only used freestanding, have you had any issues with that? I am interested in the 2 man version. any feedback on it would be a great help!! It looks like a great value. let me know, please