Does your Duster "float" at highway speed?

My car likes to wander a bit at speeds around 70mph. I had the alignment shop put in +5 degrees of camber which helped a bit. My front fenders and hood are fiberglass so I'm wondering if my front end is just light and that's the way it's going to be. My front tires are 235/40/18. Rear Tires: 245/50/18.

Mine is not a Duster but I am able to run 80-90 mph for extended periods of time and it feels incredibly stable. It will occasionally want to follow “tracks” or grooves in the pavement but nothing too sketchy. Is your 09 toe positive or negative? Also, what is the camber? I’m set up with -.7 camber, +4.5 caster, and my toe is set dead ahead at a rest. Front tires are 205/55/17.