I went from Sorbo Pucks to Herbie's Tall Tenderfeet. I used their extra firm model, a lot of weight with the inner Plinth on my HW-19. They also make a standard model. I felt greater detail came, and better neutrality versus the Sorbo Pucks.
This though won't becessarily address a bass light issue though. And likely an SDS won't either. The SDS will address any speed issues, and perhaps lower noise floor of the motor a bit is all.
I'd say such is the Cartridge, and all that comes after it. And such might take some sleeping on, and further exploration, with the theme of finding-locating your weakest links.