I just noticed that spacebar stab slots may need some adjustments. Spacebar key travel feels shorter as is, likely because there is not enough room for the stab wire to fully raised.
On my board, stab wires for Enter and Left Shift keys are on the South-side. Their key travel feels fine because current plate design has extra slit on the South-sdie. But stab wire for Spacebar is on the North-side which is I think the problem.
For now, I’m going to use Dremel to clear the path. After confirming the fix, I’ll update the design if I can. Maybe doable from KLE or swillkb. If not, I should be able to do it in code.
UPDATE: I chose to just cut up the part I wanted to remove then melt the excess (~160C). Turns out burn marks are only on the adhesive paper on the back-side that I completely forgot to remove. Doh.