generally NP and Gaastra are at opposite ends of the scale
however, it is important to remember that Barry Spanier of Maui Sails used to work with NP
there are NP CK66 masts which are older and are compatible with Gaastra and Maui Sails - as per Maui Sails forum TEAM
other than that exception, i know of NO NP/Gaastra combo that works at all - supposed to be the worst combo EVER !!
i have written a post on masts and seems one of the most popular on my blog
joewindsurfer.blogspot.com/2008/07/masts.htmlguess we all have issues with these compatibilities #$%^&*()_
luckily over 80 % of the sails n masts are constant curve
constant curve mast has worked with my MauiSails hard top sail
you may by chance have fallen on the worst combo possible
Peterman writes about such matches as well , butt cannot find the fotos which illustrate the issues :(