Rather than editing the Task’s relevance, you can edit the Applicability Relevance of the action itself (see the ‘Applicability’ tab from your previous screenshots). You can AND the relevance together with whatever your Task’s relevance is. Something like the following (note that in my example below, the Task’s relevance is only ‘True’):
That said, I do think it would be better to do this via the ‘Run only when’ constraint option.