Overall the PA29/30's seem true, but you may need to inspect the machining of the holes both top and bottom. I bought one extra pair, so I was able to cull a PA for a better one. Could have been from a previous production run for why one was "off".
On another note, I reamed my APC props out to allow them to seat fully to the base of the PA. I think it's a better fit overall, threading extends past the nut and the prop sits lower. I would assume this is how they should be applied, APC did confirm that it wasn't an issue to ream (10mm???) and would likely work better than an adapter ring. The props remove as easily as they install.
On another note, I reamed my APC props out to allow them to seat fully to the base of the PA. I think it's a better fit overall, threading extends past the nut and the prop sits lower. I would assume this is how they should be applied, APC did confirm that it wasn't an issue to ream (10mm???) and would likely work better than an adapter ring. The props remove as easily as they install.