EDC16 Injection Durations(Passat 2007 1.9TDI 105

Hello. Could someone help me, please?
I want to remap VW Passat 2007 1.9TDI(105) with DPF a little bit. There is stock hardware and want stg1(remap to 60mg/str), but I cannot understand Duration maps - there are 43.85 degrees duration(60mg and 5000rpm) on stock map. Why so big diff with 2005 Passat 1.9TDI(non DPF)? There stock values for that map are 26-27 degrees and remaped are 28-29.
How much can remap max duration? I think 43 degrees are very much. There could be difference in nozzles?

AFAIK There’s no need to modify duration for a stage 1.

Remember, more fuel needs more air.

Boost I set up to 1,3bar. Now I changed limiters to 60mg, but in real life there is no much power gain. I read that, that Duration max aproxx 35*, but why Bosch calibrated to 43* possible? And why other 1.9TDI passat with 105 engine are so big difference in duration?

Same difference in maps of 2.0 16v PPD tdi BKP (Passat 140hp nonDPF Siemens) and BMN(170hp DPF Siemens)

BMN durations around 35-40@4500rpm, BKP durations 26-28@4500rpm. So as QuickTD said its due to DPF.