Whats the Best Cartridge for a LP12 w Ittok $ 500

Linn LP12 with Lingo and Ittok LVII ARM . I am using a Grado Gold with a Sonic Frontiers SF Sig 1 in the factory settings which is for HO MM. I prefer to leave the SF alone. I think the compliance match is not great with the Grado, my Aerial woofers move in and out wildly. But I still dont understand the compliance issue compleatly! Sounds fine though. I was considering a new Shure V15. Any suggestions would be appreciated. Below $ 500.00 as business Sucks now. Thanks !