Shrinking glans prevents from using ADS?

Hi

For a longer period of time I was trying out various ADS but none of them really worked well because of silly issue. I might be wrong but I have a feeling that my penis has a great ability to shrink to very small size so it will slide out of whatever is trying to hold a glans. The most effective so far was the vacuum device but still a result of approximately one hour seems to be not good enough. I had a big hopes that coils will do a job but these failed too. I even tried to make a small trick by using hair band to kind of trap blood inside glans and make it stay big enough but it also didn’t work as I expected. I am slowly losing a hope that I will ever be able to use any of these devices effectively. I was very also surprised that I couldn’t find any similar thread but it might be due to wrong keywords.. Anyway, right now I feel a little bit like I were alone with this problem. I would be thankful for any suggestions how to overcome this problem. In theory this body part should behave similarly for everyone.. But believe me, it took very long time and many attempts before I decided to write this thread.

Thank you in advance for the help.