Hey electrify, It sounds like your free testosterone should actually be higher, given how much your SHBG dropped. I don't know how easy it is for the average person to significantly increase SHBG, but I have seen a few examples online (from dietary changes and increased exercise). I doubled my SHBG with a low carb diet, but I definitely prefer the way I feel with carbs -- even if it does mean more injections, it's more than worth the extra effort.
I know that pregnenalone goes down with TRT, but it seems like HCG and/or supplementation should fix that easily. Did you have trouble dialing that in?
I am very interested to see how things progress for you with probiotics.