With the tire and wheel at normal running temperature, jack it up.
Spin the wheel and it should be perfectly round with no tread bulges, usually caused by heavy krb mounting. They disappear when it cools.
The tire should sit in the wheel well equally all round (which you can see when spinning it)
More likely the hub centric ("spigot") rings are sloppy or worse. They should measure 66.1mm ID plus a thou or two. i.e. a sliding but not loose fit on the hub and /or tight on the wheel. ...and wide enough to engage on the hub/wheel past any taper or radius.
Mercedes Benz supplied many a new vehicle with wrongly (loosely) centered wheels to give the same problem, and I understand Volvo have done the same. If those "respected" manufacturers can do it then so can your wheel supplier.
If all that's OK then have them balanced at some other place with some other tech!
Fritz
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