most aftermarket wheels need hubcentric rings. so i would suggest getting them for all your wheels. the flat spots on your tires could also be because your wheels are not centered properly.
and you cant really see a warped wheel. when mine was warped it looked perfectly fine to me. just get hubcentric rings, if its still screwed then take off one rear wheel and replace it with your stock wheel (or some shit like that) and drive around. if the problem is still there replace the other rear wheel and drive around. keep replacing each wheel one by one and drive around until it stops shaking. this way you find out which rim is facked. and if its not the rims then you have bigger problems.