We Need Tips on Communication (Long Post, Sorry)

For two very opposite people in a relationship, communication can be iffy. In conversation via text, I sometimes find things my boyfriend says to be cruel/harsh/cold. On his side, what he intended to say was very calm, rational, and reasonable. The mix up comes in his word choice and how I, as a deeply emotional human, react immediately to things. Namely when I need his comfort and reach out, but get a response that doesn't help/doesn't soothe/makes me feel worse.

Please ask if you need some clarity on any specifics but to get to the heart of my question, here's a bit about our personalities.

My incredible boyfriend is a very left-brained, non-emotional, calm, logical person. His life is lived according to things like, "What can I do to maximize my time in each area of life?" Or "What is the most logical, responsible reaction to this situation?" He's almost infuriatingly levelheaded and collected.

I am most definitely not. I feel immediately and intensely in both joy and hurt. I take what is said to me to heart even if I don't want to. And as a theatrical person, I naturally read written communication with flair and emotion.

I do understand that my reaction is 90% of the issue when our communication goes south, but I would like for him to consider his words more carefully so I can absorb them and grow instead of feeling hurt.

Issue is, when I talk to him about this, I can't pinpoint exact sentences that set me off and can't help him understand because of that. Plus when we talk in person, he is warm, sweet, understanding, calm, and comforting. All of the things that he is not via text. He is always able to comfort me when we're together because of the added benefit of touch, vocal tone, and eye contact.

How can we improve our written communication so that I don't end up feeling more hurt than I started with, and so he doesn't have to deal with that aftermath?

Couples who are the "calm one vs dramatic one" PLEASE let me know.