To properly judge the success of your seasoning, you really need a wood moisture meter. Here’s a link to a discussion of wood moisture meters:
https://www.popularwoodworking.com/a...isture-meters/
Personally, I prefer the pin type because you can push the pin in to different depths and see how the moisture penetrates.
Or, you could say, “Screw this nerd, Bob!” And figure it’s good enough already. Really, it’s all gonna equalize out over time.