I finally can say I got a perfectly straight horizon mavic pro now. I am very meticuluous to imperfections of a specific tech, kinda OCD with most of the gadgets i have. I sent mine to DJI twice because of the same issue. They sent me new drones as warranty replacement. One thing I noticed is youll get this drunken horizon even with a new unit, no crash. Production dates of new Mavic Pros were August and September 2018, so Mavic Pros are still in production. The first unit they sent me has longer ribbon cable right next to the lens. I got vibrations and horizon tilts whenever i turn, roll, yaw. Getting help from customer service is good. Took 8-10 days to receive the replacement.
Thumbs up to DJI!!!

Another positive ending, congratulations on resolving the issue and well done DJI.

Good to hear that it's all sorted now, did the roll adjustment in DJI Go 4 not have any affect ?

I levelled my horizon with that when first calibrated, and it has been good since.

Nope. It flies like my Mavic air. Night and day difference from the affected units. Roll and yaw all day still straight. Got 14 mph wind few days ago. I tested it and still straight as an arrow. Im hoping it stays the same throughout the lifespan of my Mavic Pro.

Glad it all worked out in the end

Thanks for reporting some good news around here, I believe dji service has improved greatly . Happy filming and flying.

Hi there, thank you so much for posting the positive experience here, we are so glad to hear that and will keep improving our customer service, hope you have a great time with this drone, if there is any other problem, please don't hesitate to let us know.