You might want to take a look at marlin 1.1.0 RC3 that Collin has in the Pegasus Software zip file. It works pretty well and should be a lot closer to RC6 if that makes it easier for you. I'm using it now and it's been pretty solid. I like it a lot better than 1.0.3 (or what ever is "stock" on a Pegasus). Though, I would follow roxy's advice - planning to do that when I get some spare time and a bl touch.