OK so let me say this because no one else talks about this either on forums on the net or whatever but...
I've got a bit of gyno on both sides and just thought "that's it nothing I can do about it" and they are definite lumps and they hurt a bit when you touch them.
Then I went right down to sub 200 test and within a few weeks they got smaller, softer and didn't hurt to touch. To be honest they seemed totally benign and you could barely tell they were there.
Then when I took the test back up ( I didn't feel great to be honest ) they got harder and a bit more painful again.
So....in my experience if you lower test your gyno will get better.
As with all these things YMMV.