Dick, I think I used the same LG as you did but at the time I kept a box of the APCs on hand. The small sizes are cheap so a fist full doesn't cost much. From 12 inch on they start to cost but I do try to always buy at least one every trip to the LHS, Usually 15 and 16 inch.
I haven't tried any of the small Xoars but I hear good things about them. I do use Xoars but the smallest ones I have are 20 inch. Compared to the Zingers putting on a Xoar is like getting a bigger engine!! I still use Zingers on all new planes until I have the plane/landing figured out. I tend to nip the props on landings with a new plane. Must be that crappy LG CG mentioned??
I can't stress prop testing enough. You must try them all in different sizes and pitch. I do have a number of the MAS in my filght box. I haven't found any of my planes that fly the way I like with one but if I have a bad prop day at least I have a few spares that will work. Keeps me from having to go home early.