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The air volume in a tyre acts as a rising rate spring with nice curves. A solid rubber tyre isn't, so has to be a lot harder under normal "cruising" load in order to be stiff enough not to deform permanently when peak loads go beyond the elastic limits.
A solid rubber tyre will also be more sensitive to temperature changes, meaning a tyre that's flexible enough to give decent compliance at night could be dangerously soft by lunch.
Emyr
Perhaps they will have found it by the time I am ready for the TCR.