So, if the timing is set wrong IT will only be worse during regen? Maybe I shall send a report or at least borrow another t6 to compare
It's not like timing a traditional fuel pump, these run off sensors so it is highly unlikely your injection timing will be wrong. My Euro 5 sounds like it's pinking under load whilst doing a regen (it's not pinking, it's just the injection timing change (an additional injection) to get the exhaust temperature up)