I have use Formula 560 Canopy glue with great success on all of my 1/5 scale warbirds. I too did a test using both Robart large hinge points and Dubro large scale hinges. Allowed to dry overnight, I could not pull either hinge out of the balsa stock that I glued them into. It works great, and what I like the most about it is that it cleans up with water. When it comes out of the slots as you are gluing your hinges, just keep a wet paper towel handy and an acid brush with a cup of water handy. Wipe the excess glue away witht the wet paper towel and get the glue out of the hinge line joint with the small acid brush and water.
I've installed the large Sig X hinges with the Formula 560 canopy glue on my 86" Bearcat powered by a Quadra 75, my 102" Texan with a Sachs 4.2 in the nose, and an American Eagle Spitfire running on a US .41 with an 86" span. I have never had a hinge come lose. It is just a lot less mess being able to clean up with water, and if you get it on your airplane, you just wash it offl.