I sympathize, simao. You should not have to tweak and tweak and tweak. It should be at your convenience, not a TT dictat.
Sounds like a tonearm problem to me. I don't like to set up every time, and yet I get near-optimal sound.
If you position your cartridge exactly right for your thinnest records, then they will be just a little tail down on your thickest records, which is just a little on the mellow side (for my Koetsu).
I think that you are wise to get your TT serviced at this point, and get the tech to spend some time on a good set-up for a thin record. Then revisit the issue.
Sounds like a tonearm problem to me. I don't like to set up every time, and yet I get near-optimal sound.
If you position your cartridge exactly right for your thinnest records, then they will be just a little tail down on your thickest records, which is just a little on the mellow side (for my Koetsu).
I think that you are wise to get your TT serviced at this point, and get the tech to spend some time on a good set-up for a thin record. Then revisit the issue.