You are cracking me up. Sounds like you and I would have quite a bit in common. Once my brain wraps itself around something it doesn't let go either. I'm more direct and to-the-point than my H is....and out of the two of us I'm the one who will tackle issues head-on....but we always seem to have an underlying sense of humor about things (i.e. your PowerPoint reference.)
Letters are definitely an excellent tool, but make sure this tool doesn't become overly utilized. Keep in mind that you two must learn to communicate w/each other....letters are a great way to get conversations going, but be wary of over-using letters too. I'm not saying you two are going to do that...but if someone responds to a letter w/a letter....make sure you two start talking face-to-face once you get the ball rolling...rather than corresponding
I too wrote my H a long letter....but I've never read it to him. I found that for me, once I wrote the letter....my brain took charge and it was merely a matter of hours before I initiated the conversation.
You two are on your way to recovery, I'm sure of it.