Nothing I can tell...
The outer coil will have more resistance than the inner coil, therefore more resistance.
The shallow slots help, therefore it should sort of balance out.
There is nothing you can do about it anyway, short of a rewind.
If you want to do a rewind, better off starting with a 3-ph motor.
Better off starting with the same RPM 3-ph anyway, but I use what I can find.
The only real cost is 4 neo magnets and 2 (reusable) bridges,
maybe some heat shrink tubing, JB Weld, string and fingernail polish?
So I just try it and see what happens.
G-