Concerned with a growing rumble coming from the right rear of the Mk5 wagon, I prepped myself with wheel bearing kits for left and right, new caliper carrier bolts etc before tackling the job. Not have a clear schedule, I ultimately took it to Prestige out in Botany.
Just as well I did, as it seems that I could've save my self some stress and bother. The bearings are fine, it's the Bridgstone Optilifes. They're out of round on the inside. 3 proud spots on the right and 2 on the left. He suggested that the wheels and tyres are not right for the car and that would be the cause.
The wheel issue is something I knew about, but hadn't really delved into it. At some point, someone swapped what would've been a set of 7Jx17 ET54 Classix (shod with Bridgestone 225/45) with 7Jx16 ET37 Road America (shod with 205/55) from a B5.5 Passat.
Given the large difference in the offset, I'm inclined to agree with the mech's comments. So I've now been refunded for the bearings I bought, I can now shop for the correct size wheels and tyres. I'd love to go crazy and get some 18s or 19s, but I don't think she who puts her makeup on in the mornings would be thrilled, so the stock 17" would be my limit.