Had the car since 2016 and all of the front tyre changes have been as a result of shoulder wear. I have done around 170k in the car.
The current set were wearing on the inner edge - upper or lower control were changed and the car tracked again - but the outer shoulders ended up wearing.
How often do I check tyre pressures? - probably not often enough, but we have other cars and don't suffer with this problem on the other vehicles.
The alignment specalists confirmed that both the front and rear tracking was within limits and didn't adjust ( this week). I will upload the report.
I will keep a close eye on the tyres and see what now happens.
Maybe the tyres need to run a couple of psi higher that stated?