Try a bit of a Cetane booster such as the Power Service or Stanadyne line. We get shyte fuel in Arizona since we went to ULSD.

4 Best Diesel Fuel Additives of 2018 (And Why They Work)

Use at the recommended rate. "More" doesn't mean "better".

Stanadyne is the best but can be hard to locate. The Power Service is also a good choice, either the "Diesel Kleen" or the "Fuel Supplement". We don't need the anti-gel properties of the supplement but sometimes it is all I can find.

I won't guarantee it will cure your problem but it works wonders on the OM615-617 series.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now