The 10mg winstrol didn't lower SHBG, 4 weeks on crushed it from 45 to 8

and it a also split HDL cholesterol in half, though I'm not sure if Tren is also the culprit there.
That sped up T elimination/metabolism like no tomorrow, so now I have to up dose and likely go through unhealthy peaks/valleys even on a 2x weekly protocol.
I think I could achieve the purpose intended even with as a low as 2.5mg daily, I just appear to strongly respond to the winstrol (and DHTs alike).
Anyway it's not anything I'd recommend to beginners, even low-dose could be harsh long term and requires monitoring, though I believe it's not needed to run it for long intervals, probably short cycles of the compound are more than enough to keep it down, it depends how stubborn it is, there is clinical data showing that SHBG stays somewhat lowered for months after cessation, but I have to test on myself to confirm.
As my transaminases were already elevated (I also took tons of NSAID recently, so I dunno if the winstrol is the sole factor) I had to discontinue.
It's probably more useful as "kickstart" when high SHBG levels prevents TRT from working, especially if symtomps are still present and everything else has failed.