I measured the string height on my acoustic -- it's 3mm at the 12th fret instead of the 5mm specified in the manual. No wonder I've got a buzz! Loosening the truss rod puts relief in the middle of the neck but doesn't do much at the 12th. 2mm seems like a lot to shim the bridge.
- I pulled two 1 mm shims out from under my saddle when I set up my fretted acoustic for Pyramid strings. My string height @ 12th went from 5mm to 3mm.
- Are you using the "feather light" touch that this instrument demands? Makes a difference.
- Are you certain the buzz is from the fretboard and not the bridge? I got buzz from where the strings broke over the saddle and crossed the wooden bridge, especially when I lowered the saddle for the Pyramids, had to countour the wood quite a bit.
- My S-U-B with TGs is 4mm @ 12th with no buzz.
Pretty sure Kala would do a setup for you, but don't you live where you have any access to a competent guitar tech?
Good luck with it.

