Nice looking rock. I had a pretty good one about the same volume, maybe even a bit bigger - almost exactly filled the bucket, and stuck out a bit. Got it in - yes, toothbar a big help - and had no probably lifting it with the tach at 2200RPM. Felt a bit wobbly, so traveled with the bucket just a couple of inches above the ground.
I bought the CK20HST partly because it was the smallest tractor rated for 1000 lbs in the bucket. This rock had to be closer to a ton. Is the tractor under-rated, or just a lot stronger at low lifts? If I were more energetic, I'd try to figure out max capacity at the 3000 PSI limit based in cylinder diameter and arm lenght. Anybody already done this?
Anyway, plenty of oomph, I've only ever jacked up the RPMs in scary hillside situations; usually use the BH around 1800-2000RPM, unless I'm in a hurry.
-Chelydra