Hey Dave,
I have the same set up as you, The side slide controls how fast it grabs and the top knob is how hard it grabs. I have mine set at side slide #3 And top at#6.5 this seems good for me. But my unit is'nt as heavy as yours, you have to play with it and see what works for you.
Live Well, Love Much, Laugh Often
Dano & Wife of Dano
Franklin, GA
2006 Montana 3000RK
2006 Dodge 3500 Diesel
Quad Cab 4WD Dually Laramie Pkg
16K Draw-Tite Swivel Hitch
Draw-Tite Brake Controller