Thank you for your kind words Sandstone, I do hope I will be able to solve this issue. BTW I did level the platter. The only thing I have not done is play with the anti-skate as it is rather tricky on this TT. I do hope that's not the culprit of the problem because modifying that would be out of my comfort zone.
Talking about the Concept TT, I would not buy it again... mostly because of all the settings being so hard to reach (except for the VTF, everything is at the bottom of the TT). Just my opinion.