Boeninghausen listed remedies so similar in their action that they antidote (opposite action) each other. This principle you quote sounds as if it is extended here however because the same remedy is used in a different dilutation I would simply expect a redirection of the vital force into a modified and "gentler" reaction to the too high dilutation if the remedie is the similimum. Magery Blackie is known to have used higher dilutations to achieve this modified response to a remedy also. The fact that the vital force is then redirected by a further stimulus is the antidoting action.
"....it is possible that when the aggravation from this dose takes place, a second dose of the same remedy may produce the contrary, and thus bring about a lasting improvement,......" Hahnemann (sorry cant remember which #). Kent - "the similar remedy is most likely of all others to antidote that drug". This all with respect to the enantiopathic remedie rather than the similimum.

merrilee