What the *#$@ happened??

Maple is the most popular, I never heard anyone use ebony or ironwood, as an example.

My plinth, platter and armboard are made of cocobolo, which is denser than ebony and similar in density to ironwood. The plinth and platter are also loaded with multiple chambers of lead shot. The maker (sadly, no longer in the TT business) experimented with and sold TT’s made from many hardwoods, including ebony, over the course of a 5 year development project. His findings were generally that, the denser the wood, the better the sonics... for the reasons Larryi explained. I heard several iterations, owned three, and completely agree with those findings.

Maple was tried early in the development and quickly discarded as less than satisfactory when compared to denser (though admittedly more costly) options.

Larryi’s post was astute. Listen closely and try to distinguish between sound that you "like" vs. sound that is more revealing of the actual performance as recorded in the grooves. On a sufficiently revealing rig, the artificial aspects of studio recordings become apparent. A good TT reproduces the truth, whether we like it or not, and it sounds like your tweak may have gotten you a step closer.

Thanks for all the info gentlemen, I appreciate it. And thanks for the detailed explanations redglobe and dougdeacon. I'm going to leave things as they are for now, and spend some more time listening to a variety of recordings that I'm familiar with. I have a feeling that you guys hit the nail on the head.

While I certainly appreciate the length of the explanation of various woods, I d respectfully like to disagree strongly on the underlying premise - that density of the wood is what’s important for the sound. In fact the better sounding woods such as Mpingo wood, maple and spruce, to name a few, are not particularly dense. I could post the table of wood densities but I’ll leave that for the student. It might have been I who mentioned ironwood as I often use that wood as an example of a very dense wood that doesn't do much for the sound, as a form of irony.  Get it?  Of course ebony has a wide usage in musical instruments as well as Mpingo discs and other audiophile products. I used to have an ebony turntable clamp product myself way back when.

Is it better to hear "the truth" and not enjoy it, or to hear something more coloured that you actually enjoy? I will take the latter.

Yeah, let's not get into the woods too far.
Cocobolo, which is rosewood species, and Brazilian rosewood could theoretically work in some applications. There is much more to woods than density. No-one makes guitars or violins from ebony or ironwood, though I heard than some do from African blackwood.
If I wanted to try something different under my table, I would try some rosewood species first and spruce second, for now maple will do.