If that helps:

static stability margin is
30% with C/G at 50% (2.5in)
18% with C/G at 60% (3.0in)
12.5% with C/G at 65% (3.25in)
6.5% with C/G at 70% (3.5in)

Neutral point is 3.8" behind LE.

I'd shoot for 62% to 66% balance point.

BUT, if incidence angles are given and no advice is given to change them (by shimming), I'd just test glide the model and modify C/G position until a straight glide is achieved. That's what I was told to do in the 1960s.