Great bass from a linear tracking arm?

...says that the key to great bass is not higher pressure but a light cartridge.

I use my Kuzma Air Line for a while now and I tried various cartridges with it. Mainly those, I know very well from Phantom or DaVinci and I am still learning.

The lightest Cartridge I have at the moment is the Zyx UNiverse and it works absolutely excellent on the Kuzma. I am really impressed, there is no big difference - or no loss - to the Phantom or DaVinci. Bass is great on classical records like Stokowski- Hungarian+Roumanian Rhapsody.
I would rate it as a real killer combo.

When I use the heavier ones, there is definately a change in performance. Don't know why (yet).

The UNIverse I have has the SB, I think, it is around 9 gr. A friend uses a Zyx 100 in his Air Line and he told me, it is very good (he owns a UNIverse, too), also a Transfiguration.
I think, weight is one point, but probably the siffness from the needle bearing the other. I saw a few pics with the airline, fitted with Benz LP, Kuzma Cartr., Transfiguration, Lyra Titan etc. So I guess, weight alone is not the secrtet.