If an extra rhyme constraint distorts the message, how should it be judged?

Qalb, Tashrīʿ and Luzūm Mā Lā Yalzam: Completing the Verbal Ornaments

• Every restriction must improve eloquence
• The form may be possible, but rhetorical quality suffers
• It must become ḥusn al-taʿlīl
• It turns rhyme into qalb