Well after I have had a few more journeys in the van for work, and I am still sure there is an underlying issue with transmission of road noise / buzz through to the chassis, beyond just the reduced filtering as the tyres wear.
so once lockdown is lifted I need to do a back to back drive with another Transit custom. looks like my nearest Ford Commercial dealer is in Worcester, so I will try and get a test drive in a std van on 16" wheels,
but if there is anybody local to WR7 area with a newish custom who is OK to do a swap for a 5 mile drive to
a) give me an 2nd opinion if they think my van feels harsh
b) allow me to calibrate what another van feels like
I would be very grateful
send me a PM