Make sure the arm is grounded to the chassis of the deck itself(not the cartridge connectors but the arm itself.) Sometimes that will help.
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Under your turntable, there should be a ground connection and/or a place you could connect a small ground wire from your tone arm to this connection. Anything metal will do. There should be some screw or something on your tone arm base to connect to (probably underneath the table.)You don't want to connect to anything that would restrict tone arm movement.
I can't say for sure, but sometimes this will quiet things down. The wire to your preamp is chassis ground for the table itself. You also need to be sure this includes the tone arm. Sometimes the tone arm gets isolated and then it will pick up noise such as you describe.
Make absolutely sure your cartridge connectors are correct also.
Ouch! Sorry for your cartridge. :-(
Here's an old trick for tightening cartridge clips safely. Stick a round wooden toothpick inside the clip. Squeeze *gently* with a hemostat, strong tweezers or a jeweller's needlenose pliers. The toothpick "gives" enough to let you compress the clips without flattening them out, and you're not working on the cartridge so no risk of damaging that.
No better ideas on grounding than what Bigtee offered, except to make sure the Nait itself is grounded and that the ground it's plugged into is good. You need a ground tester for that.