If your estrogen is abnormally high, it will promote fat gain and retention, but there is a minimum healthy testosterone/estrogen balance required. It sounds like you may have had higher estrogen, and to be honest I might as well, or maybe I have a thyroid imbalance - one of these days I really need to go get my labs done to check actual numbers… I’ve had the reqs for a while now - and thus benefitted from an estrogen-blocking supplement.
This is a core component of many of the common pharmaceutical post-cycle therapy (PCT) products out there, such as clomid or nolvadex (also called tamoxifen, used to treat certain estrogen-related cancers).