I believe that you and CoachSuzanne are in agreement that TI does not insist lead hand stays patient until other hand spears. Part of the reason I did the experiment is that I thought I was supposed to be keeping that lead hand patient.
... fine, so I'm not in bad company...
Maybe you can change your thought from "patient lead hand" a little more to "patient lead elbow" and give your hand/lower arm the chance to flow
(with your swim speed) into the catch without producing any drag... But I'm sure the threshold from P to TI will vanish more and more...