Large Gap Between Stretched Flaccid Length and Erect Length

My stretched flaccid length is about 1 inch longer than my erect length. My erection quality is actually pretty good (around 8/10), and I take 5 mg daily tadalafil. Since starting tadalafil, erection quality has improved noticeably. However, despite good rigidity, there’s still about a 1-inch difference between my stretched flaccid length and my erect length. I’m trying to understand why this gap exists and what I can do to close it. Is this more related to tunica elasticity, pressure issues, glans filling, or something else? Has anyone successfully reduced the gap between their stretched flaccid and erect length? If so, what helped?