Mini displayport to HDMI = fine. Mini displayport to VGA = terrible on late 2011 MacBook Pro. Any ideas?

Hello,
I have a late 2011 unibody MacBook Pro. It has a real problem displaying through a projector or tv using mini displayport to VGA. I connect it to my tv at home with a mini displayport to HDMI cable and it works fine. If I have to connect through a VGA adapter/cable to a tv or projector for work the image always looks like the contrast has been turned right up and it looks awful. I have tried creating a profile, calibrating the secondary display and adjusting gamma settings but it doesn't make any difference.
If I plug my old black MacBook into the same projector/tv using VGA it works fine so I now have to take 2 laptops to work which is ridiculous. I thought it might be the adapter itself but at a recent event a colleage experienced exactly the same problem with his identical set up so I thought it might be something to do with the projectors set up at the event but I recently tried connecting to a projector at a different event and got the same results and now I'm confused. I guess it must have something to do with the adapter but not sure what.
Any help much appreciated.

You really have to mess with the resoluton, espescially the refresh rate, as it varies from projector to projector, monitor to monitor. Even within the same brand! Because so many manufacturers are trying so many different things to become the next cool kid on the block, and the way the formats are being configured that's now part of the game.
That's why so many professionally produced corporate shows hire a dedicated projectionist for the video presentations. Too many bugs in the honey.
Refresh & sesolution are the first things to look at.
Just so you know that colors in PowerPoint PC, and PowerPoint Mac, don't exactly match... go figure.
I forgot to mention another thing, sometimes it's the projector that needs to be tweaked.

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