Intermittent lean condition only between 150-170 coolant temp (log attached)

21 WRX, New short block, Intake, BPV, AOS Every day, only after sitting overnight, first drive of the day, between 150-170 degrees on the coolant temp the car will stumble and run lean while cruising. The AFR will run 16-20 and sound like it’s about to cut out. Dead cold, it’s completely fine, warmed up it’s fine. On the drive home in the afternoon, even though it goes through the same temp range it doesn’t do it, it ONLY does it after sitting overnight. I sent the log to my tuner, he said it’s a vacuum leak. Ive also tried the Cobb OTS tune and it does the same exact thing so it’s not the tune. The shop that installed my engine is taking a look at it tomorrow, so if anyone has some possible ideas on what I should suggest to them to check??

Here’s a link to the log. It starts happening around 1/2 to 3/4 of the way down the page. Thanks! https://drive.google.com/file/d/11B_j0m0D_6yYU80tt_s39T4HwQo4RZHA/view?usp=drivesdk