"What do you know about your arm, was the 103 a good match?"
Seems like a good match. 10 gram effective mass or so. It’s written down somewhere.
No way 10g is optimal for an oldschool low compliance cartridge like Denon 103. At least 20g effective mass! And very few modern arm will be as high in effective moving mass. 30g will be even better, remember that compliance of Denon 103 is extremely low, this is a stiff cartridge, so superheavy effective mass is a must!
Tonearms with 10g mass designed for mid of high compliance cartridges. It is always surprise me when people buying an oldschool monster like dl-103 without having an appropriate tonearm for this cartridge, it is absolutely pointless.