SL-1200G/Hana ML Best Headshell

Yes, it did come with an additional weight. I think that the OEM headshell is 9.5gm

Trying to get resonance around 10hz, but pretty difficult to calculate without knowing arm mass.

Don’t bother. The titanium headshell is probably too heavy, if it really weighs 19 g or more. I’m not sure you would benefit even from changing the original headshell, but if you feel like experimenting, I would go with the carbon fiber headshell largely because of lower weight. You realize probably that a spec about the weight of the cartridge that the tonearm can handle does not tell you anything about the effective mass of the tonearm. Anyway, I am sure you’ll be just fine with either the stock head shell or a carbon fiber headshell.

Yes, the titanium headshell and Hana ML are at the upper limit of possible combinations that are possible, but not necessarily ideal.  I've asked Technics about the mass, but don't expect an answer.

I like the Soundsmith wooden one.  I believe in low resonance for mounting a transducer. Especially LOMC.