Home Row Modifiers - Balancing tapping term for responsiveness without missing too many strokes

Hey all!

So, I just completed a Cheapino build, and so far I'm relatively happy with it, even though I'm struggling to get the layers under my hands (that's just practice).

FWIW, I'm using Miryoku.

https://preview.redd.it/h8ki44x67jxd1.jpg?width=1024&format=pjpg&auto=webp&s=431d2afabb671477267dfdfe7baa611ab9b5b414

One thing I'm kind of struggling with though is the timing for the home row modifiers. I seem to either accidentally trigger them, blocking further keystrokes, or when actually trying to use them, miss it, accidentally causing both key to write a character. Is this a common problem? Experimenting with the term hasn't really helped -- 200ms seems to be the best balance. Is it more of a skill issue? or does this maybe sound like a build issue?