Hi Geoff,the screw that connects the hinge arm to what you call the mounting plate could be restricting further adjustment if it is too tight,try and loosen it a touch and see if this helps any and then tighten back up.
Your kitchen cabinets will be tight initially when you use it it will become loosen. If still its causing you a problem try opening it closing it for sometime continuously it will become a bit loose but not much.
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!