225/40/18 is a harder size to hide any tire imperfections.
Your tires do so because because of the nylon belt(s).
Tire makers came up with fancy new names for new and improved nylon belts like polymide.
Tires with nylon belts listed on the tire plies construction tend to handle great.
You cant have the best of everything when it comes to tires.
A lot of replacement tires offered in your size may provide a better ride, but wont give you the razor sharp steering response
Dodge chose to equip your car with.
An example would be if your OEM tires have 2 sidewall plies. Replacing them with tires with with 1 sidewall ply will take away handling.
Many people will pull out of the tire shop after such a tire choice and say "these tires ride so much better".
Lets see what happens when you hit that on-ramp at 50 MPH Gilligan.