If you like the sound with your digital source gear just just replace your current cartridge with one of higher output.
You can get a nice 1.0 mv Grado for $600 as well as gobs of high output MM's
in the same and even lower price range.
Assume that they (even though less expensive) would sound better than the current mismatch you are dealing with.
If the dealer who originally set you up is local have them install it.
DeKay