Audiotechnica OC9MLII High, Low or Med Compliance?

I replaced my Linn Arkiv with an OC9II on a Linn Ekos (a medium mass arm), and an interesting thing happened. On any album with even the slightest warp (most), the woofers on my Linn Keltiks pulse in and out wildly which severely saps amplifier power. I asked my dealer why and he said it was a compliance incompatibility between the Ekos and OC9.