But the shackle angle between stock and a shackle flip shouldn't make that much difference either.
- New lift springs will likely be stiffer than the worn out stockers
- aftermarket shocks will likely be stiffter than the worn out stockers
- if you used poly bushings in place of the worn out stockers they will be stiffer
- if you tightened up the spring bolts too much it will cause it to ride stiffer
- What about tires? I'm guessing if you lifted the truck 7" you also put on different tires? Bigger more aggressive tires could cause it to ride stiffer.
You also have to keep in mind that somebody's perception of it being a "huge difference" would be "hardly noticable" by somebody else.