I'd like to see some alignment reading. lets say static alignment is ok. then other possibilities could be.do you ever rotate tires?? make sure tire psi is ok. Low tire psi causes positive camber to happen and rapid tire wear. the other possibility is in/out of tight spaces,wheels turned to full lock causes tires to lean out at the top.+ low tire pressure.= outside tire wear. does it handle ok?even in wet road conditions? alignment off will usually cause some instability. cheapy tires will also cause premature wear. some cheap tires have a real soft sidewall,tires kinda roll over on themselves on turns. Front tires will always wear on the outside edge.it's the leaning over on turns.
is there extra weight in the back that isn't there when you have it aligned?squatting in the rear takes weight from the front,& the tires will lean out at the top.
The shaking when braking is most likely warped rotor. Just because there new doesn't mean a thing. I've had some bad right out of the box. problem is getting worse.aftermarket parts in general are iffy.