I'm strictly a rag chew CW type guy, which is a completely different style. I know OPS who blaze 30 WPM on exchanges who struggle trying to carry on a conversation at 13.
I'm a rag-chewer, too--my getting faster was more by accident & practice than actual intent. I know what you mean about the 30 WPM folks when they slow down--maybe it's because the cadence changes slightly?
Some of the best CW ops I've talked with were ex-military--they have an amazing fist!
73 DE Klaus