As you probably know, bodybuilders have worse testicular shrinkage yet can bounce back via clomid etc. There have been guys here who have reversed the shrinkage via the usual meds, but actual symptomatic improvement doesn’t often result.
Haven’t tried serms myself but may give it a go, although reports of guys actually getting worse after their use are worrying. I think my shrinkage may have worsened in that they don’t grow back to maybe 3/4 size like they often used to, also sac is seemingly always tight these days.