The more powerful Pitts are closer to model airplanes - the 12 is a BIG model airplane
using a symmetrical airfoil and and setting the panels at 0-0 will work just fine - On our Buckers we did just that -for best results
here is the caveat - if your mode l is relatively heavy or underpowered -it will be closer to an underpowered full scale bipe
all this busines of special airfoils and placing one wing at a different angle - is just compromised settings to compensate for low power and higher weight.
If yours is to be mildly aerobatic - use the dihedral in lower wing - it looks better but for full ot aerobatics it won't matter - you wil have to allow for rudder couple tho--