Do not read too much into Denon's compliance number. If you do a search at Vinyl Asylum, there is a general concensus there that Denon's number is not particularly accurate and that the real compliance number is closer to 9cu. A member there has measured the reasonant frequency of his 103R in a 10.5g SME V to be just under 9 and many people feel that the Denon works well in many medium mass arms as well as those with higher mass.
Try it as it is and see how you make out. If you feel compelled with adding mass to your arm, I'd suggest using blu tak on top of the headshell and not adding more than about 3-4 grams to start off with.
Try it as it is and see how you make out. If you feel compelled with adding mass to your arm, I'd suggest using blu tak on top of the headshell and not adding more than about 3-4 grams to start off with.