Jittery image on VGA projectors with MBP

Recently I have had trouble projecting presentations from my MacBook Pro (15", early 2011, OS 10.8.3, 8 GB RAM) to several different VGA projectors. I am using a mini-Display to VGA adapter and use 2-screen mode (not mirroring). Initially, everything is fine - the projected image looks clean, but after a while, lines start to zigzag and jitter - as if someone was physically bumping the projector (or like a bad TV signal). This gets progressively worse and makes it nearly impossible to give a professional presentation (which I am required to do for my job). I have bought a brand-new miniDisplay-VGA adapter - no improvement! I am very careful to make sure that connections and cables are all solid. The same problem does NOT exist for external monitors hooked up via DVI or HDMI adapters/cables. Any suggestions/ideas?

First I tried flicker filter, and it helped some of the photos, but others became even worse! (The entire image shakes now instead of just portions.) I removed the flicker filter and tried the de-interlace filter, and that produced about the same results. I would try editing the photos separately in Adobe Photoshop, but before I delve into that I would like to set up an external video monitor. Unfortunately I've wasted about two days, and I can't seem to get it to work. I first tried by connecting the iMac to a Sony camcorder and connecting the camcorder to the video port on my television. No joy. Then I tried connecting the iMac via a mini-DVI to video adapter to my television. I thought my old television might be the problem, so I connected instead to the video port on a projector, and it still didn't work! I've changed the display settings and deleted certain preferences files, to no avail. My iMac doesn't seem to recognize the external display. I'm beginning to doubt this Mac purchase. Thanks for any help you can provide!

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Thank you Tom. I like the suggestions, but still a little unsure about the mechanics of a few things you mentioned.
1) Mirroring: I see in my Displays control panel a box that says, "Show mirroring options in menu bar when available." Does this mean that we connect the projector to the HDMI port on my MacBook Pro Retina, then an icon will apear along my menu bar at the top of my display? Then I select "mirroring" from that?
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Jittery image on VGA projectors with MBP

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