I am a relatively new owner of an Orpheus, circa 100 hours of playtime. I have gravitated to a gain of 64 dB using a Sutherland (battery powered) phonostage (i.e. no step-up), 90 ohms resistive loading, ~1.94 g. VTF. I am still fiddling with VTA, with the cartridge mostly in the range of nearly parallel to the TT surface which appears to give a reasonable SRA - and most importantly, the best sound. I agree with Jtimothya above regarding azimuth adjustment. I was trying to adjust the by minimizing crosstalk (1K Hz test tone/ voltmeter) and listening, of course. I found that the azimuth kept changing; not dramtically, but there was more variance than expected. The problem appeared to be the cartridge had really not been fully broken in - I was taking measurements at 10, 20, 30, etc. hours. The variance has gone way down now that I have more hours, so be patient with your adjustments recognizing they may change.
Finally, the "O" sounds awesome - truly a highly resolving, but very lifelike cartridge.