Your amp is not likely to be true class A... it just uses some section of its circuits that can be called class A... a marketing ploy that has been used many times over the years. The heating issues you are suffering are entirely a know problem with this amp as it can be thrown by unusual loads.
None of this negates the fact it's a well reviewed amp but you just neeed to accept its foibles.
As a matter of interest I have four hi-fi amps here reaching back to 35yrs old and all will drive headphones only with no issues so it's not a common problem across all makes.... as you've found with the Rotel.
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