RE: Mini F-16 vintage project consideration
Flat bottom wings have served me well with 1/2A speed planes.
If the plane is small enough and clean enough, make the wing as thin as structural limits allow and you will find that the airfoil isn't rocket science.
The important thing is to make it smooth and flowing with no dips, ridges, etc..
Place the high point as far back as you like, just trust your eyes for what looks clean.
If you want full aerobatics, then go with something else..but for all out speed on 1/2A models, flat bottom airfoils that are 1/4" thick with an average chord of 5 or 6 inches work very well.