Help with cartridge output

Hi all,

So I recently sent my Pro-Ject 5.1SE off off the Sumiko American headquarters in Cali to have the tone-arm rewired after I botched installing a new cartridge and snapped one of the tone-arm wires. They said they'd also install the AudioTechnica 150mlx MM cartridge before they shipped it back. I had previously run a Sumiko Blue Point #2 MC cartridge

So, got it back the other day and spun the first disc this evening and discovered that I can get almost no sound or dynamics from the AT150mlx. I'm running the tt through an LSA Statement integrated which handled the Blue Point no problem at all - -full sound, lush dynamics, etc.

And now for all practical purposes there's little sound being generated; no bass, little volume. Every other parameter is the same; just the cartridge is different. I've made sure the tracking force is set correctly, the stylus is perpendicular, the arm is parallel to the platter, etc.

The LSA has a MM phono stage, yet it handled the 2.5mV Sumiko MC just fine. The AT150 is a 4 mV MM, so what gives?

Any help would be appreciated. I could switch back to the Sumiko, of course. Or sell everything, turntable and both cartridges, and go for something different. Or get out of vinyl altogether - which I don't want to do, of course.