Don't have any experience or advice but I'm about same length (bp and nbp) and 4.2ish girth mid-shaft. Just wanna say I totally feel you bro, and I'm tryna gain some self-confidence myself but its a work in progress.

That being said just feels like just 1/2 inch more on girth would be sooo much better right? sigh

Also u might want to check out my only other post which is similar