Sure it's adjustable!

Loosen 4 engine bolts.
Back 2 out completely, and set aside.
Slip out the fiberglass shim.
Adjust angle using sandpaper, a flat surface, and a little elbow grease.
Put the shim and bolts back in.
Repeat for the other side.
Tighten everything back up, fuel up and fly.

Takes 5 minutes, using tools you probably already have at the field anyway.
On the OMP 47" Edge, shoot for 2-degrees right thrust and adjust from there.

I prefer to adjust my plane mechanically first, then work from there with mixing.
But then again, I'm no Chip Hyde either.