You clearly have some potential there, my chest looks kinda similar to yours. I guess i had some real gynecomastia too and being overweight hasn't helped. I tried fenugreek and i guess it gave me a little bit of an head start towards larger areolas, but i remember it being ineffective unless i took 6 pills daily (around 500mg each one). No side effects but it was obnoxious to take all those pills daily. Dropped them because i wasn't very constant with them. This year i started with something i always heard of and never had the opportunity to try: Pueraria Mirifica.
It is way stronger than Fenugreek and you can feel an increase in sensitivity quite fast (first weeks). I know you are not looking for something fast, but i'd personally suggest trying PM directly but at a very low dose like 500mg (1 pill). Usually the recommended brand is Ainterol, which ships from Thailand, but there are also other brands which ship from UK storages and such. If you are interested there are quite some threads about it.
Have a nice day