For me its nothing to do with the line its the thickness of the line on the Spool , As said above it will bed in if there is a few layers of line. I always preferred spools with bar spacers as well rather than a solid spool. Much less prone to bedding. I use drennan floatfish sometimes and have found it ok.Yes I think anymore than 50 yds is a no no Ged the Berkeley Fireline was hollow as well, same stuff as your Ultima I think.
Ill try again shortly and see if this Maxima makes much difference.
O M W