Exactly what I did once I started to introduce the 32. I could barely press it up, even with assistance from the other hand, so I did sets of floor presses with the 24 and always floor pressed every weight I used for the TGU.I start all of my TGUs with an unassisted floor press. Brought my tgu up from a shaky single with the 24 to a steady alternating 10 reps with the 40 over the past 3 months and I still can't overhead press the 32. I never train the press though so that must be it.
@Steve Freides, you are right that there is always a choice. Louise Simmons has written about the benefits of relaxing momentarily on the, typically he refers to using a bar but also DBs.@T2725, one can elect to relax at the bottom of any press, or not - the floor press can be done staying tight the entire time. If there's a tendency to relax the tension when one is floor pressing, that's something I'm not aware of.
-S-
Then I tried the 32 doing a standard press and it looks like some of you were right, my pressing strength is back to where it was.