The stab is where I had the biggest problem and it affected flying seriously.

I would use the flat portion of the wing saddle on the fuse. as a reference point.

NOTE: I used the Robart indicent meter for this work.

1) Use the flat saddle and level it using a graduated level.

2) Take the horizontal stab and attach it to the stab saddle.

(I had drilled my 2 nylon mounting bolt plates and use the nylon bolts)

3) Shim the leading edge of the stab for a MINUS 2 Degrees.

(I know you are asking Minus? but consider if the stab is Minus 2,, when the stab is ZERO the wing is at +2 Degrees,
The +2 Degrees has worked well on mine and I experimented from - 2 in 1 degree increments until I reached +2)

4) Mark the leading edge of the stab on the fuse and this will give you a reference to mount the stab.

The Leading edge bottom of the stab was just about flush with the bottom of the fuselage where they touched.

Hope this helps. I would consider this a critical step.

Jim