Well, it looks like you might be learning that Fester isn't a really good company to support, a little late but your learning.

I would have gone with a Swiftech MCR120 on the door which would have allowed you to use a standard straight compression fitting instead of the swivel that is leaking. With the sheer amount of water cooling hardware available nowadays, there is almost always an answer to avoid swivels/angled fittings.