I looked at another pair of shoes at the parts store,Different manufacturer. They were noticably thiner and tapered. I liked the ones I had, so I ground down some metal where they contact the adjuster and wheel cylinder. Everything fits and works great, thanks to the posters that suggested it.
I am having the same problem with my 610. Got new shoes from O'Reilly and had the drums machined. I turned the adjuster in centered everything, still too tight. It looks like the shoes can be put on two different ways also making them hit in slightly different places. I checked my books and pics online for proper orientation. So now I will try grinding a bit of metal off where shoe contacts the wheel cylinder as suggested. I'll let you guys know how it goes.