I use a mechanical hackamore (short shank, flat fleeced line noseband and leather curb strap) for trail riding. Is that the style you used? Or is it the long shanked, hard nose band ones? Those ones are super easy to often unintentionally turn into something harsh and uncomfortable for the horse. I must say, to date and after many years of riding with them, I`ve yet to find a horse that didn`t like my style.
One thing caught my eye in your post: your horse has navicular apparently. It may be that cantering out on the trail (uneven, hard ground, little stones, etc.) may be causing him pain that causes him to act up.