[gsck]

I kinda went through this when I joined my current employer. My boss's emails were (are) at worst unintelligible and best hard to follow, weirdly formatted and generally hard to grok. Usually they are just blocks of text that are one big garden path sentance. But it all magically goes away in client communications

Not sure why this is, but it never really bothered me. It took me a while to learn my boss's interpretation of the English language. I don't think its a case of being in a position where it doesn't matter, other department heads don't do this, I reckon its just down to necessity.

You aren't trying to portray an image of yourself to your team, you don't need to come across as a poet laureate for internal discussions.

If you are trying to craft an image of yourself to your team instead of doing your job well and letting your work build your image you are doing something wrong

Spend your time wisely, put effort into your emails where it matters, format everything nicely, double/triple check your grammar, but among colleagues you don't need to pretend