We're the tires balanced good ? Little weights on the inside, or outside I guess (hate that). Hopefully not 3+ weights on them.
I was going to say if it sounds like high rpms then do wheel bearing, I just did mine today and problem solved, but...you did them already. Can test them by jacking up and putting in neutral and spinning tire while holding spring , if springs vibrates it's your new bearing (new thing come broken sometimes)
Good luck. I have a beater 2006 cobalt now as my beater beater...for when I work on my 2001. Own two Volkswagen gtis , 2001 and 2011.