My JVC TT QL-A5 has a medium mass tone arm per what I read on the internet. I am not sure what the tone arm weight is as specs state 220mm length, 15mm overhang & weight range 12.5 to 18g including head shell weight. I do not understand the 12.5 to 18.5 weight spec. I am using a Grado Blue. The Grado Blue likes light weight to medium weight tone arms. On my TT it fails tracking on a test record. The second level of five levels on the test record the Grado starts distorting on high frequencies, but on standard vinyl recordings it sounds good. If I change the stock 11.5 gram head shell to a 7 gram head shell would this help with the 4.5g tone arm weight reduction?