It is worth playing with the loadings, I don't know the cartridge 1st hand but they are popular on the forums. Sounds like a mismatch in there, and adjustment is more fun and less economically challenging than blind cartridge choosing. Bear in mind that the incompatibility may well remain with a new cart, only the frequency abberations may be shifted to a better/worse combo.
You need to consider the cartridge, arm wires, arm lead, and phono stage input as one system and adjust at that point. Maybe the arm lead is super high capacitance construction - litz or similar?
Check out this link where somebody is adjusting a 2m black loading:
Ortofon 2M Black - frequency response charts | Steve Hoffman Music Forums
Looks like for that body 32k ohms is a good spot, and although it's not the same body it's worth a try. So a 110k resistor soldered across the RCA socket of the input will get you there. What's to lose?