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Ian,
The fitting problem with the longeron curvature you have was not a
problem for me.  My installation eliminates the header tank and utilizes
the forward hinges supplied by Lancair.
Since you did not use their hinges possibly you have not followed
Lancair's recommended  16 layers IIRC of unidirectional carbon fiber on
the canopy frame forward of the plexiglass.  This greatly stiffens the
canopy frame and should eliminate the flexing problem.   Installing the
plexiglass would also help if not yet done.  Since I have a slooow build
kit, I had to install all stiffening foam on canopy frame. The foam is
the width of the longerons with the fiberglass overlay extending down
over the longerons to assure alignment of the canopy and longerons. If
after all of this the fit is still binding, simply sand the forward and
aft edges of canopy to fit.
Good luck and keep building
Doug

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.