I think you can get more height by substituting a Ford F250 Torsion Key in there. Or kits are available that basically give you a new key and new bolt, so that more adjustment can be made.
Some people on here did it, a few years ago.
I was able to get mine very close to level with the stock setup. Mainly, I wanted the Driver's side raised up to make the truck level side to side... I was tired of the "lean" to the left the truck seemed to have.
That was very do-able with the stock bolts and keys.
The way my truck rides and drives should not change... And I don't see why it would or should, really. But I'm no genius on suspension questions.