How long did you run this experiment?I have done both of those things. My experience:
On transcrotal testosterone my LH and FSH are always 0.
Less than three days after stopping cold turkey, my LH and FSH return back to their pre-testosterone level of 5 and 3, respectively - as does my endogenous testosterone production.
Zero long-term suppression or issue whenever I have decided to stop.
What dosage/frequency?
If the HPTA almost immediately rebounds to the exact same level as per both of your posts, is there anything stopping you/us applying 100mg+ transcrotally on a daily basis?