4th gen rears done but ?

[Railing68]

I just finished complete 93-7 z28 pbr swap on my 12 bolt. I used the GM brackets and shimed the calipers. I got the rotor flush using lugs and washers then test fit and centered the caliper. Everything went ok but a kit might of been easier, especially the bracket end of things. Anyway, I realize that there should be some drag which there is and the wheels can be turned fine. But I notice that each side seems to have a spot in the rotation that has more drag. The calipers seem pretty well shimmed and if they were not wouldn't there be excessive drag constantly? It almost seems like a high spot or something. Should I just consider this due to an older housing or axles are not perfectly flat or ? I haven't driven it yet but any input would be appreciated. I am not a 100% sure that there is a problem but it seems wrong to me. SS