I just recently bought GGXXAC+ and I've been having problems with the Rekkas too. I mess up at 46S but if I get that part in then I can (usually) follow up with Dangoku with no problems. I have to do 236S-41236S-Dangoku, though, or else I either jump or mess up the input. I haven't started working on FRCing Dangoku yet but it sounds like a lot of fun and I can't wait!
I'm on a pad by the way. I plan on getting a stick soon though. Do you guys think it's way easier on a stick?