I hate upping old threads, but this guy up here bumped it, and I would rather do this than post a new thread.
I'm having a similar problem as the OP. I just picked up a Luxe 1.0 all stock as far as I can tell other than 2.0 eyes and a violent trigger. I cleaned and re-lubed everything this week and when I aired it up to check everything I noticed a very slight leak that can be heard right at the top of the grips.
It's such a slight leak that it could have been there the last few weekends that I've been playing and I just never noticed. I only noticed it the other day because I was quite room by myself. So I started reading the stickies and all through this thread as well as other and attempted to troubleshoot.
I started by changing the bolt sail oring, same deal. Tried changing the oring on the top of the reg, as well as rebuilt the reg, same deal. I replaced the inner can orings, no sauce. I tested the fitment of all orings and everything seems to be sound, per videos that I watched.
A few times the leak would seemingly go away so I'd go shoot it. Still not there. I would degas it, and go do something else. Being the paranoid guy that I am, I would pick it back up later and air it up and the leak would be back.
Any ideas? Thanks in advance, I know you guys get a lot of these same questions.