Recently bought 05 525i 6spd with 169k miles. Runs sluggish in 3rd gear WOT as if fuel cut off/cylinder missing above 3k rpm. Vanos seals replaced less than 500miles. New spark plugs, coils, valve cover gasket. At first fuel trims were

STFT1 4.7
STFT2 9.4
LTFT1 15.6
LTFT2 14.8

After plugging vacuum nipple leak on manifold, new fuel trims are

STFT1 -14.1
STFT2 -11.7
LTFT1 18.8
LTFT2 18.0

Will long term eventually drop to normal level as time goes by?

O2 seems slow as it doesn’t fluctuate lean/rich rapidly but does give instant rich condition if I tap on throttle.