A TikTok can open with a clear line and still lose viewers immediately. The wording may be weak, but the first frame might be making a different promise from the one the video actually delivers. Changing both at once makes the next result hard to interpret.
Try two openings for the same content format. In A, the first second shows the finished outcome: the completed edit, final product, or result viewers are about to learn about. In B, it shows the starting problem: the messy timeline, unfinished product, or mistake the video will resolve. Keep the spoken hook and on-screen wording identical. Keep the rest of the video, caption approach, and posting conditions as consistent as practical.
Compare the first few seconds of retention, not just total views. If one visual repeatedly holds more viewers while the words stay fixed, that is a useful signal for the next iteration. If both openings lose viewers at roughly the same point, test the wording next rather than rebuilding the whole format. Neither outcome is a verdict from a single post.
A workable stopping rule: make a small batch of comparable videos using both opening styles, then review the pattern only once each has enough views to make its retention curve readable. Also note the initial view sample. A post that barely reached viewers gives you less evidence about the hook than one with a clear early drop.
How are you distinguishing a weak hook from a distribution issue when the first retention curve looks bad?