Also, for some weird reason, its doesn't matter if i have it on AV or if i leave the AV mode and change TV stations, its the exact same thing on every screen the messed up computer image.
Hmmmm, 0.5 ohms on the sync line should not be enough to cause a problem.
A few things for you to look at:
1) Make sure that nothing is accidentally shorting in your SCART header, e.g. all those gnd wires you have.
2) Check out the polarity of horz & vert sync in your video card. As you have a Radeon, I guess that you access this by right-clicking the desktop -> properties -> settings tab -> Advanced button, then choose the monitor tab. This will only work if you have the catalyst software installed. Polarity shown should be either composite or both negative, whichever works for your setup.
3) try doing the 5v + 100ohm resistor method to pin 16 (and GND to pin 18)
4) If you haven't done #3 yet, try hooking pin 18 to a VGA GND to see what happens.
What I do is cover the ends of my wires with insulating tape or heat-shrink, to make sure that the wires don't get pushed together and short in that tiny SCART housing. (interestingly, though irrrelevant, I prefer to make my cables from new headers with spade connectors built and use small brass female quick-connects for my SCART connections. I actually use very little solder. This makes things a lot easier).
While you have your multmeter out, try plugging your cable into the PC VGA and then use your multimeter on diode test to check out all the GND pins you have wired into your SCART header. I expect that you'll find that they are all common to each other. Now, pull the cable out of the PC, plug the SCART into the TV, and check all the GND pins on the VGA end. Again, I expect you to find them all common, even though you have wired them all separately.
What I'm trying to say is that you can save a lot of time and potential trouble by wiring your grounds together onto one SCART pin (e.g. 17, or any other will do, even audio ground!). Just an idea, It is a personal choice thing I guess
You might want to continue wiring the VGA and SCART shields separately though.