Leaking turbos after overhaul

[INTERPRO]

Good afternoon,

I just did an overhaul after 1.4M miles and I noticed that the new remanufactured turbo from Cummins was leaking oil excessively thru the cold side. It was spinning at 11k RPMs and it had about 2.5lbs of PSI at 18% on the actuator position. I got a second turbo with similar results.

I decided to install the original turbo because I didn't have that problem before the overhaul. Once I tested the original turbo I noticed it also started leaking oil at a lower rate, but this one made more sense because I had 0 PSI boost at idle at 10k RPMs with 18% on the actuator position. I attached some pictures at different engine RPMs. I been running the @m*m^2 since October 2015 without any problems.

Things I checked:

Ventury pipe was welded instead of using the stainless washers
Oil drain pipe from the turbo to the engine block is clear
I am using the maintenance free crankcase breather insert.
calibrated the VGT actuator.
I don't have any restriction on the air filter.
No excessive blowby.
I dont have any engine codes
I double checked the pressures with a streeglow gauge that has a vacuum and 0-30 psi reading.

Thanks in advance for any help.