All of the above plus increase the VTF to the highest in the cartridge's range, or even .1 gm higher. See if that helps.
If all this fiddling doesn't restore the balance, conclude that this used cartridge is not properly balanced and if it continues to bother you seek a return and refund.
If all this fiddling doesn't restore the balance, conclude that this used cartridge is not properly balanced and if it continues to bother you seek a return and refund.