P2177/P0171 System Too Lean off Idle

[Gothic]

Hello everyone, I hope this is correct forum and sorry for my bad english but I hope you understand.

I have a Audi A6 2.0 TFSI -07 with a fault code P2177/P0171 System Too Lean off Idle, and its start getting frustrating.
Any help in right direction would be very, very, very appreciated.

I can start off with some values:

Clear all fault codes.

Start driving:
32 - LTFT - Idle 0 %
32 - LTFT - Partial starts at 0% but keep rising when driving and stops around +21%
33 - STFT - Idle +15% before driving but keeps getting lower when driving (because of LTFT addaption i assume?). When accelerate this value always gets a high positive value (maybe thats normal?)

After my test drive:
32 - LTFT - Idle 0.5 %
32 - LTFT - Partial +21%
33 - STFT - Idle pending between -+3%

Engine is running fine at idle and even under load but after some time (2 hour driving) the check engine light turns on.

Action taken:
Before I started to analyse this in depth I thought my fuel filter was clogged - Replaced
Discovered that N80 valve was leaking - Replaced
After that I saw that my fuel pump (LPFP) had a high reading (60%) which may indicate a bad pump - Replaced
Then I read that this is typical behavior for a bad MAF - Replaced
In desperation I also replaced my high pressure fuel pump (HPFP)

Still at square one

I have watch everything on youtube regarding this issue and also googled anything I can think of but I still can't figuring out what the problem is.
Can it be a vacuum leak? I have checked everywhere (hoses, hose clamps etc) but cant find anything. Shouldn't the LTFT going down at high RPM if it is a vacuum leak? Here it just keep risning.

Again, any help would be appreciated!

Edit: Added car info

[peoplz19]

Have you tried a new pcv.

Sent from my SM-G973U using Audizine mobile app

[ROH ECHT]

Have you had it checked for leaks? II have a P-Flo intake. I smoke tested mine and saw it leaked where the MAF is installed into the intake. I fixed the sealing there and multiplicative dropped from 17% to 8%. I found no other leaks, so mine still has an issue elsewhere. I need to replace its lpfp. It has a good N247 sensor. Not sure if it has a leak in the exhaust or the exhaust manifold. Injectors are S3 and they have 96k miles on them. As said, no leaks in the vacuum or intake systems. Fuel filter is new. The MAF is good. You may want to work through these items as well.

Can you post what your HP is and what the maximum mass air in g/s you see near redline?