I'm on Testosterone Enanthate at 400mgs/week. I'm also taking Letrzole to try to reduce the gyno knot I have, and also keep aromitzation at bay with the T.E.. I'm using 2.5mgs/day of the Letrozole. I'm thinking maybe my estrogen levels are too low??
If he has a hard lump while off the only thing that will make it go away is surgery.
If it is soft the best thing he can do is get off everything and try nolv.
Some people have said Arimidex works too.
The big thing here is he seems to be very sensitive to test. I would go with a lower dose. That alone should minimize it if anything will!