Turbo_bimmer, I forgot to mention. I had the car two times a while back at an experienced Indy who tried to find the problem with autologic but no luck.
He did the fuel pressure test and he noticed the pressure going down a bit after turning the engine off but for some reason he didn't mention or relate anything to the injectors.
Since neither him nor me were were able to find the problem using the diagnostic tools I did a search for 'leaky injector symptoms ' and found pretty much what I experience.
To replace all the injectors is costly. I will try the tricks you guys mention or release the fuel pressure after turning the engine off and see how it starts after a few hours.

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold