Warm Start Issues After Diesel Tuning (1 Cylinder)

hello!
"On a 1994 Passat with a 1Z engine, we're experiencing annoying starting problems when the engine is warm. We replaced the injectors with 0.216 size injectors, and the software has been adjusted accordingly, but now it struggles to start when warm, which it never did before."
The car initially only had a chip installed; after its 225,000 km, we decided to give it new injectors, and why not install larger ones at the same time?
To start with, before we made any changes, we checked the pump's injection start time, and it was below the lower tolerance limit.
After the adjustment, it idled much more smoothly. Then I replaced the injectors, and now it runs like a kitten. The only issue is that it takes about 3-5 seconds to start when it's cold.
Sure, no problem! Here's the translation:

"Thank you in advance!"
Sure, here's the translation:

"mozz" translates to "cheese" in English. It is a type of Italian cheese that is made from cow's milk.

"The fuel injection pump was replaced about 15,000 kilometers ago due to severe jolting/jerking, and that fixed the problem!"

Hello,

It would have been better if you had adjusted the fuel injection start timing (in the basic setting mode) using the new injectors instead of the old ones.
Because it is likely that your new injectors have a higher opening pressure, which can be compensated for by adjusting the injection pump accordingly to advance the timing.
If I remember correctly, Ulf also wrote something similar in his report, namely that the other nozzles needed to be adjusted after they were installed.

Best regards, Rainer.

Thank you, I thought someone who can read would have an advantage, and I actually found something using the search function as well!
I'll do it today and of course, I'll let you know how it goes!
Sure, here's the translation:

"Hi, how are you?"

Rainer K. wrote:

If I remember correctly, Ulf also wrote something similar in his report, namely that after the... The installation of the other nozzles had to be adjusted.

Hello.

That's absolutely correct; it's also mentioned in the specialized article on "Düsentausch" .