I looked into vince's log and saw that the spread is in the level of the TDCs of the different layers.
When I look at the TOF of the different layesr with no EDTM I get the peak for all at about the same palce.
When I look at the EDTM location is see that it shifts significantly for the different layers.
I need to talk to Vince\Alex tomorrow to understand where exactly the EDTM comes into the data stream so we could understand if it's a problem or not.