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I spoke with my mechanic friend and he told me that the problems I describe sound like "harmonic issues" - vibration caused by some loose or broken rotating mass hitting its resonating frequency causing it to shake or vibrate.
I'm thinking the shop may have been on the right track with their assessment that the flex discs (front and back) need to be replaced because they are cracked. The vibrations seem to occur at the same RPMs - 1200-1300, 1700-1800, 2100-2200 (hence the harmonic issue lead) and only under load. This leads me to believe that it could be something with the driveshaft.
I plan to replace the front and back flex discs as well as the center bearing. Hopefully this will solve my problem.
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2007 328xi Wagon, Black Sapphire Metallic, Sports Package, Cold Weather Package, Rear PDC, Airlift kit with 3P mgmt, CF Akrym rep lip, LCI M-Tech front bumper, LUX Angel Eyes, Black Kidneys, LED Interior Lights, M3 Steering Wheel with Extended Billet DCT Paddles, 19" Staggered VMR 710's
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