Notwithstanding the fact that the 103/103R will not be a good match with the Grace as others have mentioned, there is also, as others have alluded to, something seriously wrong with the setup on Grimace's table.
It would be pretty unlikely that an extracounterweight would be necessary to balance a cartridge that weighs 6 grams; typically extra counterweights are necessary to balance heavier cartridges (as in the plus 8-10 gram category).
Crazy as it sounds, the first thing I would check is to make sure the counterweight is on the right way. Take it off, turn it around and re-install it on the arm, balance the arm to zero and re-set the tracking force and see what happens. Short of that, it might be worth taking the taking the table to someone who really knows table/arm setup to get this thing right. It's pretty likely that Grimace will be much happier when he gets this resolved, possibly to the point of not wanting to do an upgrade as it sounds like something is seriously out of whack with the setup at the moment.
It would be pretty unlikely that an extracounterweight would be necessary to balance a cartridge that weighs 6 grams; typically extra counterweights are necessary to balance heavier cartridges (as in the plus 8-10 gram category).
Crazy as it sounds, the first thing I would check is to make sure the counterweight is on the right way. Take it off, turn it around and re-install it on the arm, balance the arm to zero and re-set the tracking force and see what happens. Short of that, it might be worth taking the taking the table to someone who really knows table/arm setup to get this thing right. It's pretty likely that Grimace will be much happier when he gets this resolved, possibly to the point of not wanting to do an upgrade as it sounds like something is seriously out of whack with the setup at the moment.