Try spraying a little wd 40 penatrating oil into the intake manifold at the end of a glow plug cycle when you start to crank engine. Get a friend to help. If engine comes to life you possibly might have a fuel supply problem of some sort. I was trying to suggest my thoughts earlier on perhaps why your compression readings where as they are in my post. You have loosened an injector line off to acertain that fuel is available when cranking? These two tests are cheap and easy to do. Just might reveal something. Certainly will not hurt anything. You of course remove the top of the aircleaner and spay directly down the throat as the wd 40 will not pass through the aircleaner filter.