given that you have read the entire thread, you must have came across Namor's chart, I would say go with that chart. I went TTS on my Marlow wingtips and they are a bit loose, but I like it that way. The best way for you is to buy two sizes from RL.com and try them on and see how you like them.
Could be. I only washed it once. I will see how it goes. I do cold wash and hang dry. All the Kamakura shirts that I have did not shrink much at all, I hope this could be different. Otherwise, it will be going to my tailor.