Jeese Loiuse
The original designer probably liked his setup so at least start -from HIS referrences . And now for a BIG hint :
there is no magic incidence setup
None
Zip
Nada
Typically a model needs a wee bit of angle between the wing and the stab - but VERY little- just enough to counteract any other forces for good hands off level flight at cruise speed .
One degree is : 1/4" in one foot
This means that if you actually could measure to within .001, you would see that a foot wide chord -at the root- would have the true LE 1/4" higher than the true TE.
That is a lot on an aerobatic model which is very lightly loaded (wing loading) OR very fast .
Those bubble level thingies can easily lead you astray-especially if entire wing LE/TE are not perfect.
The true ZERO LIFT chord line is one where the airfoil -irrespective of the shape - generates ZERO lift
CG is where you will likely spend the most time sorting out what compromises YOU like for your flying.
there is no magic CG either .
If more "designers" took time to build a pot full of flat foamie dsigns and sort out and understand what is happening - they could save a lot of time and money of big models - the same forces are at work on both but the foamie "fixes" and "trims" are quicker and easier to do.