[ms stang]

I recently bought 18 inch by 9/10 saleens with sumitomo tires 275/30/18 and 285/30/18 and my car feels real floaty. i most likely need an alignment from hitting a curb a couple weeks ago fooling around..but it didnt seem a problem with my stock tires, i feel it the most when im on the highway to the point where it feels almost like hydroplanning? any ideas or anyone have similar problems?

[heavy metal]

i would do an alignment first.