Hello, am Danny.
With you stating you are continuously losing air pressure. Have you checked to see if there is a leak or something stuck in tire (nail/debris) that might be causing the loss of air pressure? If tires are ran low on air pressure for even a short time it can cause wear spots and will cause a vibration like you have stated. I have attached a tutorial for you to view.
https://www.2carpros.com/articles/how-car-tires-work
Hope this helps and thanks for using 2CarPros.
Danny-
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Wednesday, December 12th, 2018 AT 9:56 PM