Regarding pen width... open the Gboard app, go to Languages, tap the Handwriting keyboard you've added and change the Handwriting stroke width. "Extra thin" is like 3.0pt pen whereas "Normal" is like 12pt. Definitely better than nothing.
I'm not entirely sure I'm seeing the flickering you're speaking of on Gboard. I'll take a look at SwiftKey, but I doubt it will do better for the line drawing lag that I'm seeing.
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