How many hours have you put on the cartridge. It could be that the cartridge is either still breaking in, or, after break-n, the tonal balance has shifted in a direction that you don't like. The shift in channel balance could be the result of the antiskating now being less than ideal following break-in, but, it still seems a bit hard to account for such a shift.
During and following break-in, a cartridge's tonal balance can change quite substantially. If the bass response takes longer to develope (a common break-in phenomenon), the impression of less "air" (i.e., less high frequency emphasis) could be the effect of a bigger bass response.
After the cartridge has settled in, you can try adjusting the VTA and/or loading of the cartridge. Raising the tonearm pivot (tail up) slightly to increase the VTA can restore some of the "air." You can also get a similar effect by changing the cartridge loading. You should try a higher value loading resistor (meaning LESS loading) to get more "air." For example, if you had loading set at 100 ohms, try 150 or 200, or even wide open (47k ohms).
During and following break-in, a cartridge's tonal balance can change quite substantially. If the bass response takes longer to develope (a common break-in phenomenon), the impression of less "air" (i.e., less high frequency emphasis) could be the effect of a bigger bass response.
After the cartridge has settled in, you can try adjusting the VTA and/or loading of the cartridge. Raising the tonearm pivot (tail up) slightly to increase the VTA can restore some of the "air." You can also get a similar effect by changing the cartridge loading. You should try a higher value loading resistor (meaning LESS loading) to get more "air." For example, if you had loading set at 100 ohms, try 150 or 200, or even wide open (47k ohms).