I've been taking CPA for 13 months now, and it generally brings my testosterone and libido down to zero even at pretty low doses. I was very depressed when I started HRT, but I was also very depressed before I started HRT. I think changes I made to exercise, i.e. from couch potato I started running several times a week, plus changes to my nutrition to whole plant foods helped my mood. Whenever I eat fatty junk food the depression hits me again, but that might be psychological, not a chemical effect.
So maybe CPA has depression effect on me, I don't know for sure.
I think I'm going to try switching to Spiro myself, though I've been very reluctant to do so because it makes people pee a lot, and I already pee a lot. I get up 3-4 times each night because of a full bladder. Part of it is perhaps due to the high water content of my food, plus I still feel thirsty for lots of water in addition to that. I also have a theory that all the fiber and nutrients in my food might give my body the conditions to remove excess materials from it, and it might also deem the hormones I am taking to be an excess that needs to be removed.
I'm probably going to switch to Spiro anyway and hopefully I won't get too "pissed off" by the result... shall I update?