Need a bit of help with Genesis RGB/VGA and LCD monitor (works, but a few issues)

Hello,
I was trying out RGB from my Genesis to a Samsung SyncMaster 204B using the A/V out on the Genesis (R, G, B, C-Sync, Ground).
Looks pretty good. All the colors are present (R, G, B) but they were a bit washed out. Since then I've added 75 ohm resistors to the R, G, B lines and the color, saturation is alot better. It's still just a bit off...but not bad now.

Next issue I'm having is a 'shimmering' effect. Seems to be associated with the CSync output. Tried adding a few different value resistors (75, 100, 150 ohm) but just gets worse.
Here is a video I did on youtube, it's starts at 7min. 14sec, where you can see what's going on:
http://www.youtube.com/watch?v=JhZYTjd3AZQ#t=7m14s

Someone made a suggestion that I add a LM1881 IC to get a clean(er) Sync signal output.

Much appreciated if anyone can give me some advice to eliminate the 'shimmering'


Also, I was wondering what generates the 15KHz H. signal. Is it the RGB encoder IC (it has an internal oscillator) or an external oscillator or something else externally.

Thanks,
Thomas

At the mo im working on a project following fagins mod to clean up the picture on my 40" sony bravia which includes the LM1881 chip http://www.youtube.com/watch?v=aWNmwo9fb_A but this requires the din to scart cable (can purchase from ebay for around £10) But..i have seen a similar cable that you have made which has the LM1881 sync stripper chip inline of the cable http://www.youtube.com/watch?v=77Hvo90LF7U If you find that this is too bulky maybe you could fit it into the vga connector casing as the chip is only small. Hope this is of some use to you