
Probably not much help to you, but I thought worth a mention.
My Staffordshire had a fairly large haematoma (not as big as golf ball sized though :()on one of his ears, which after 3 attempts of draining still filled up. In the end, after the last draining attempt, I looked at other options and every day bathed his ear several times with chilled witch hazel liquid, and then applied arnica cream several times too.
Now it may be complete coincidence, but the haematoma did reduce and his ear went back to normal. I can feel some scar tissue and lumpiness on his ear however.
Not much consolation to you, but as I said, thought I would mention. Best of luck.