I just tried it and imported the save fine from the cartridge into the CIA-converted Luigi's Mansion.
Didn't have to create save data or anything. Just installed it and imported the save right away.
Are you sure your conversion went alright and the resultant game had the proper unique id? (0055F)
Which version of savedatafiler (or SDK version) did you use to do that? I have the CFW installed, with devmenu and savedatafiler, but when I try to launch SDF, it crashes and tells me "the SD card has been removed."
I'd like to use CFW to transfer over some retail saves, so how were you able to do that?

