Until you choose your number of poles you can't make any winding decisions. Four pole would have 3 concentric coils , 6 pole 2 concentric coils and 12 pole wold only have one coil per pole pitch per phase. When you have chosen your number of poles you might as well stick to Zubbly's coil spans, then at least you have a reference.

If you say you chose those little magnets to settle the air gap then you have decided on magnets 10mm thick unless you machine more off the rotor core, I would have gone for minimum of 12 mm.

The big snag with small pole numbers is that you really need proper curved magnets. Attempting to approximate with rectangular magnets gives large mean air gaps. The circular magnets fit the curve better but do waste a lot of potential area, you can't really win with common magnets.