Nice gains you had! Really inspiring.
Yes, I was very happy, but sadly didn’t manage to cement them. I will this time though.
The only secret I think was consistency. I didn’t do that many sets either. Usually 4 sets per day and some days more. Some days less. Also wore an Xleeve and did manual stretches throughout the day as much as I could.
With hanging SO, I was sure I was stretching my dick and not skin though.
I don’t think your length should be an issue with using a Bib Starter. Maybe try to do some prestretching first. Have you tried hanging SO?