Ever since Paragon 2.0 was revealed I have been working to max my solo XP/hr and I have finally come to a place where I think I am pretty close to capped out.
I am up to ~220m xp/hr on average with a single-run high of 260m xp/hr so far!
I have written a relatively comprehensive guide on the subject with videos/maps/text so people can digest the material in whichever medium suits them best.
This is specifically targeted to the monk audience (and is on the Monk forums for that reason) but I believe the route will work for any class that can effectively "prime" or run through Decaying Crypt.
Note -- I do not personally benefit in any way shape or form from these videos so don't worry about self-promotion for profit blah blah stuff! :D
As always, feel free to ask questions and I will do my best to answer!
"Life is either a daring adventure, or nothing at all" ~ HK
Druin, the happy monk