Lowering the tonearm at the base (my suggestion) will increase the bass, but go too far and you'll lose the mids and highs, so be careful. Also, adjusting the VTA will affect your VTF, so re-measure that when you are done.
Before adjusting, attempt to determine if the arm is parallel to the playing surface. Based on your symptoms, I would guess the arm is higher at the back and lower at the cartridge. If you can see that it is higher, without having to use a ruler, then it's WAY too high in the back. Otherwise, the way to measure is to lower the arm onto the record (use a beat up record) and use a ruler to measure the height of the arm at two points. That will tell you if the arm is higher at the back. (It's not that easy, truth be told, because the JMW9 arm is tapered. You have to look closely.)
And be careful not to knock the arm with your ruler or hand, since its sitting in the groove. I wouldn't want my advice to result in a busted cantilever!
Good luck.
Tom
Before adjusting, attempt to determine if the arm is parallel to the playing surface. Based on your symptoms, I would guess the arm is higher at the back and lower at the cartridge. If you can see that it is higher, without having to use a ruler, then it's WAY too high in the back. Otherwise, the way to measure is to lower the arm onto the record (use a beat up record) and use a ruler to measure the height of the arm at two points. That will tell you if the arm is higher at the back. (It's not that easy, truth be told, because the JMW9 arm is tapered. You have to look closely.)
And be careful not to knock the arm with your ruler or hand, since its sitting in the groove. I wouldn't want my advice to result in a busted cantilever!
Good luck.
Tom