RE: .074 MARAUDER !!!
The drag issue with the Spectra line would be my only concern. But with a nominal size for the 20 lb test stuff at .009 it sounds like it fits the bill in every manner. Certainly weight or mass wise they fill the niche most excellently. And a spool of the stuff is cheap enough that you can have a set for 52 and one for 60 foot line lengths and just chose based on the wind conditions of the day.
I look forward to hearing about the flight results.