Yes. adding damping can (speaking in broad terms) help you out when using a slightly less compliant cartridge than would otherwise be ideal.
When I had the AC-300, my main cartridge was a Benz M0.9 - one of three cartridges in the wood bodied line that was the first step up from the Glider.
The three cartridges in this "model" represented three output levels - the L0.2, M0.9, and H2.0, with the model names reflecting the cartridge's output in millivolts.
If I could, I'd stick with the broad range of cartridges (including Benz) that had a compliance in the 12-15 range.
I used minimal to no damping with the Benz, BTW.
There are likely other fine headshells out there, but the Sumiko is certainly one of the better ones which doesn't cost huge $$$ (as in the Ikeda headshell amongst others). I like the fact that it's machined from a solid billet of aluminum.
Cheers,
Thom @ Galibier