I GOT FLAT SPOTS ON MY TYRES AFTER 15000 KM... NOT IMPRESSED AT ALL

Hi there, well after sitting on the wall on what to buy ?. Well I really went for it & through caution to the wind,money wise being a true Yorkshire man but could see & appreshiate previous heritage with new material & compounds marying each other.Then going out their & proving at the ecstream edge of compretition at all levels on the roads of grit sand tarmac rocks.
I also wanted that rugged look to my Sprinter 216CDI Van. She my van handled well in all conditions & returned very good MPG of 48 to the gallon do 60-65-70 mile/hour.Everyone who see my van look in admiration & even take note of the tyres also asking about the tyres.
On B back roads uneven terrain 40Lbs PSI,35 to 45mph. On fast B road & A roads, Motorways 50Lbs may be 52Lbs max. ALL@ COLD TYRES TEMPERTURE.