In the menus on my Dell monitor you can disable any scaling, so you should try that. The picture will be small, but it will reveal whether the artifacts come from scaling or not. Also while in WB, try to use the auto calibration on the monitor. It doesn't work when the picture is black so it is often a good idea to start it manually once the picture is on and stable. If these two does not reveal anything, start fiddling with the phase like #2 writes.
I agree with #2 as for the composite. It looks like it usually does and composite was never good. A good RF connection is about equal in quality to composite.
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