FWIW the Cap stab -in the scale location works extremely well -the lowered stabs are easier to do structurally and I have done them in various positions for that reason. but the benifits of lowering it for any real performance gain -- in my book -- extremely questionable - read that horse sh-it
some excellent full scale aerobats have relatively high stabs -the Zlin 50 for example .
in order of importance - weight then power then weight then power then weight then power .