Holding the razor flat along your face is probably one of the mistakes. You know 30 Degrees is said to be the ideal angle, which is my experience too. The next mistake is probably too much pressure. I've been through that one too. During my first straight razor shaves I used too much pressure. I think I didn't trust the razor of being sharp enough. Coming from Shavettes I knew the razor would not be as sharp and wanted to force the razor to cut my beard by using more pressure. After similar unsatisfactory results to yours I later just barely scraped the lather off, like I would with a shavette. That was an eyeopener!
You have the best of equipment. All the hones, razors honed by honemeisters here in the forum. Sorry to say that most likely you are the problem. Then again you can make the change. Your equipment is best.
Good Luck to you.
OldSalt