Congrats! That's a fine hammer, though I can't say much for their customer service.
I bought mine new, probably 10 years ago now.
1) Oil should be supplied by continuous mist, not heavier than SAE 10W non-detergent motor oil, no additives, no synthetics, not anything but straight oil.
2) The hammer comes from the factory set to work best at 140-150psi needing 15-30cfm. Also, very important that you have at least 1/2" line and 3/4" fittings from your compressor because this baby gulps lots of air in bursts of over 100cfm. In fact, what I did to make it perform better was put a 10 gal. bladder tank right next to my hammer, after the inline filter/drier/regulator/oiler assembly.
3) I just played with the linkage adjustments until I got it behaving the way I wanted. I've got the operators "manual" somewhere, if you want I'll see if I can find it and scan it for you.
My compressor has a 30gal horizontal tank with a 12hp Kohler gas engine and 2-stage pump. I run it at 175psi and set the inline regulator to 150psi. Moisture is kind-of a problem, even with the drier, but the bladder tank does dual duty, actually helping by acting as a final stage condenser. before adding the extra tank, the pneumatic valve sounded like it had a sinus condition at times. Also, I do not have any quick disconnects or anything that would constrict the air line to less than 1/2" dia. and I've got 3/4" hose connecting everything.
-Alan-