so barring anything actually broken with what ya got: torque is found below ~2500, HP is found above. that's just how our engines work. if you wanna go fast, gotta rev it.
but my advice is to slow down rather than throwing money at more HP. contrary to what you might see on the freeways in Atlanta, driving on public roads is not a race. There's no winning. no trophy. just a never-ending roll of the dice to see if today is the day that someone staring at their phone messes up your truck. brakes are where I'd invest my cash. and a bigger swaybar. maybe a rear swaybar too. whatever helps me dodge the idiots better.
try swapping the coils left to right. it might not be the springs doing the lean. but either way, RE does sell a decent product. another option is simply shoving an extra spring isolator on the low side.