Hi,
Sometimes just the way things are explained gets confusing.
Lowering SHBG will lower the Total Testosterone number, but your FREE TESTOSTERONE will rise. Seeing your TT number decrease might worry you, but it is a falsely inflated number because of your SHBG.
Your system is over compensating to try and keep with Testosterone production for the hungry SHBG. My SHBG has been as high as 120, while my TT has been over 1200+. But the TT number is meaningless because it doesn’t belong to me, it belongs to the greedy SHBG. So I have off-the-charts Testosterone levels with ED. 
My endo and Urologist could not understand this - kept telling me I was ok because I had “plenty testosterone”. The specialists I consulted understood it immediately.
My story, if you get bored. I’m still on my journey to work this out. High T, FSH, SHBG, Low E2 No Libido. My Lab Results (pellets) - #33 by traveling-man