What I did - and I'm handwriting the manuscript/first rough draft of a non-technical book - is the slow down to whatever speed allowed me to form letters consis

What I did - and I'm handwriting the manuscript/first rough draft of a non-technical book - is the slow down to whatever speed allowed me to form letters consistently and neatly. I found this to be massively effective, and I recovered my cursive script that I hadn't really used since I was 12, and am now up to "full speed" again. Like anything really, slow deliberate practice is pretty much the only, best tool you've got.