Stardust, I have - or had - the opposite situation.
I had estrogen levels almost three times the target level that CX aim for and at the same time had my T level rise back to its starting baseline despite continued Dutasteride at the previous dosage.
For 5 months, the little tenderness I did have in my breasts vanished altogether and there was no change in size whatsoever.
To overcome the now ineffective Dutasteride, they gave me a Decapeptyl implant (triptorelin). My breasts soon became a little tender again though my E level (they cut back the dosage) fell to just below the lower target threshold and then fell to the upper limit for a "normal" male - but now 6 weeks later, my boobs are an inch bigger!

?
Since my E level was SO high, it seems that the only logical explanation is that the T somehow prevented ongoing development - which highlights how puzzling your own high-T situation is!