Welcome, humblepotato and good post.
If there is one piece of information I would offer, it us that you should not feel pressured into coming to conclusions too soon. It is quite enough in the beginning to unlearn the lies you were taught by the WTS. This in of itself will help you develop the proper lines of reasoning needed to ask questions as you experience life, since now you are able to think for yourself. Btw, I am an atheist today. I just did not come to this conclusion overnight.
Like yourself, I read Ehrman, Dawkins, both of Ray's books, lots of religious history, lots of history, biology, etc. In fact, most of that I read within the first two years of leaving. I was still an agnostic at best. If anything, I would say learning physics played the biggest part for me in allowing myself to accept atheism. This was in 2011, a whole 5 1/2 years after I left.
My point is, I probably had enough information long before I understood anything about relativity or quantum mechanics to become an atheist. For me, being a big picture thinker, I could not commit until then. I believed there were still too many unanswered questions. My simple point in all of this is, you will know when your questions are answered to satisfaction, and that is when your existentialism will ease. This process is automatic if you just let it happen.
So keep questioning, and keep an open mind.
d4g