As usual, sparkyx is giving some good advice. I also agree with Happy on “proprietary blends”. You paying a real premium for those blends. As far as a supplements are concerned, I do believe Arginine helps along with drinking a lot of water.
Some other things to consider on flaccid hang which I don’t think were addressed are stress (physical and mental) and caffeine. Just like some supplements may help, IMO caffeine has the opposite affect and really kills flaccid hang. I don’t know how much coffee you drink or the popular Energy Drinks but in my experience they have a negative affect. I love coffee but have tried to cut it down to 2-3 cups in the early morning.
I don’t have much stress in my life so when I do its noticeable in my flaccid hang. You could still be stressed out or maybe feeling down on what happened to you. It just might be affecting your flaccid.
My best flaccid hangs are usually when on vacation. No stress and usually only get 1 cup of coffee. Just my 2 cents on flaccid hang.