The weight on the cartridge could be the culprit. Too lihht may rob you of bass. It will show more on loud passages and possibly certain points on the album due to tracking.
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Just a guess,since I never had that problem.The first thing that comes to mind is a bad connection.Since you biwire,I would play some bass heavy music and wiggle the cable at the binding posts on your speakers.One of the posts may be bad,the cable itself,a connection inside the cabinet[hope not]Next maybe switch the cable ends so the ends for the bass are now passing signal to the mid/tweeter and vice versa.Try each speaker one at a time,then try the amp end.That's a start anyway.Best of luck to you.