you can sure reduce the size to a small degree, as well as tenderness and pain with chemicals, but to get it back to normal you will need surgery.
i feel for ya bro, SD started to give me gyno during pct as well a few cycles back... I curse that compound, it upregulates progestin/estro receptors or something and makes you super gyno prone for a period of time after d/c the drug, which is weird.
but PCT is a time when a person is very susceptible to gyno anyways, the lowered testosterone to estrogen ratio and reduced DHT can cause gyno. sounds like you still have reduced test from an incomplete recovery...
sorry bro, surgery is really the only way to get it taken care of... you can get on an AI or SERM and it will help in the mean time but don't think it will fix the issue, I successfully treated my SD induced gyno with a combination of Letrozole, proviron, cordyceps sinensis, and aromasin.
it was kind of a "shot gun" cure but it successfully reduced mine to a point less than it was during puberty, i have great nips now! but mine wasn't all that noticeable even at it's worst and the hard tissue was the size of a very very small button. (smaller than a dime) i can still feel tissue in one nip but it is so small i dont even care, you can't tell at all shirt on or off, i look great.. but it really was bad enough where i was depressed about it for a while (it was after my first cycle too) it made me really insecure for a while...
surgery for this is pretty common, they can do it like lipo where they just suck the tissue out... i think it's around $3-5k and a lot of places do financing... i;ve heard the lipo method is the best because it ends up looking the most natural afterwards... but really if you have a good doc i think ur g2g anyways...
don't take ATD though!!! for some reason it made mine worse.