I'm nobody special, to the Ruby community, so I'm not going to claim my opinion carries a lot of weight, here. That being said, you have to see how characterizing Loren's work as a "hostile fork" isn't the most neutral thing to say.
It would appear to me that you've definitely moved past the role of mediator, but when you say things like "I must at least strongly consider the opinions of the current maintainers of RubyGems" it sounds as though you're now casting yourself in the role of judge, instead.
You're doing great things with RMU -- we thank you for it, and I'd hate to see the fallout from the role you're attempting to play here overshadow your great contributions to our community thus far.