Well, I can't think of anything that will randomly make a car lean. What do you mean it leans, it pulls or the car actually drops closer to the ground on the rh side? Crosswinds?
Have the shops you've taken the car to actually driven it and heard what you're hearing or do they just put it on the hoist and make sure nothing obvious is flopping around or falling off? If nobody came for a drive and it's easy to reproduce the noise then find a shop that'll come with you on a test drive.
Regarding the noise over 70mph, this'll sound dumb but it might be your air cleaner snorkel flapping away. I had a few drivers complain about a weird noise on the highway caused by that. Or it could be a bunch of other things.
Last edited by Fummins; 11-26-2019 at 05:09 PM.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)