Hello
My XX2MKII improved greatly after about 50 hours or so, and continued improving for a while after that. Although Dynavector recommends a 30 ohm load, after I achieved optimal set up, and with a Modwright SWP 9.0 Signature phono stage, the cartridge sounds best at 500-1000 ohms. Others on this forum have also stated this loading works for them. From what I experienced, when your cartridge is not optimally set up, it won't sound good at anything much beyond 30 ohms.
Regards,
Dan