Why does my vinyl sound so bright?

Michell Gyro upgraded to Orbe Platter with DC motor, etc. Zeta tomearm, Sumiko Blackbird, into PS Audio GCPH. I'm not looking for a world beater rig, but boy it's kind of bright during playback. Wasn't always this way, so something must have changed, but the only thing I've changed is moving it onto a wall mounted shelf, at least that's the only thing that I've changed on purpose. Any tips on where to start troubleshooting this?

Complete vinyl imbecile here, so be gentle and talk slowly...thanks for any help!