That's a big ass raw bench.... I compete multi ply but I've been hunting a 600 raw in the gym for a few years too. Sounds like you'll get there first!
As far as "Has this ever happened to you?" I'm assuming you mean a massive PR that a training partner calls that you didn't realize you had in you?
Yeah, at my meet last weekend! Sometimes the best thing we, as lifters, can do is to shut up and listen....... If you're in Michigan try to take a trip out to Detroit Barbell sometime. Clay Brandenburg is the man out there that you want to talk to. He benched 930 in a shirt and is a tank raw. The guy knows more about programming and bench mechanics than most guys ever will. At the level you're at it might do you good to talk to the guy.
Let me know if you need contact info.