Don't worry about finding things specific to your supposed lift height. Go by your alignment data. You can use anywhere From like 3 - 6 degrees. IME it's hard to go too much with positive caster. But a little bit the wrong way sucks.
Also you can't judge tightness of bushings by pulling on them. The forces under driving conditions are huge. You need a prybar with lots of leverage on things to see how easily they move. Bushings in good shape will resist any metal on metal contact most everywhere even with a good effort with...