Macbook Pro VGA adapter resolution issue

I have an Optoma projector that has been connected to my Lenovo laptop for the last 2 years. I have just decided to set my mac up to it, and had a mini display port to VGA adapter. The native resolution of my projector is 1280x800, yet when I plug in the mac, I can only get 800x600. If I change it to optimize for the built-in display, I get a scaled image of 1280x800 on what is really 800x600. This has been extremely frustrating and my searches on the web have proven unsuccessful. I have tried the PRAM/NVRAM restart where you hold Option, Command, P + R, and it has not resolved the issue. How can I display the correct resolution, which is exactly the same as the Macbook itself??

Upon more research, I have learned that holding down the "option" key while clicking Scaled in the Display Properties will allow you more resolutions to choose from. I now have the option of 1280x720, 1280x768 or 1280x960, but still not the true resolution which is 1280x800!! How ridiculous! Why can't the MacBook determine the resolution of the projector and use it to its maximum potential the way Windows did?

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