I have a TNT Jr. with HRX motor, an original JMW-12, and a Ruby 2. You have an excellent table and cartridge, so it should make beautiful music. Maybe I'm biased, but I don't think the problem is with the choice of equipment.
My general approach is: start with the most simple fix and work up from there. So, I would first double check to be sure that the table is perfectly level. If it's not, the whole presentation will be off. Next, I'd try lowering the VTA, which is easily done and the solution may be as simple as that. (To second Frogman, LOWER the VTA). Next, I would try a different cartridge loading. Perhaps try these simple things, in order, and then report back?
My general approach is: start with the most simple fix and work up from there. So, I would first double check to be sure that the table is perfectly level. If it's not, the whole presentation will be off. Next, I'd try lowering the VTA, which is easily done and the solution may be as simple as that. (To second Frogman, LOWER the VTA). Next, I would try a different cartridge loading. Perhaps try these simple things, in order, and then report back?