Well, as I mentioned, the pictures above exaggerate it since my camera makes the image "bloom" quite a bit. It is noticeable in normal usage, but not unusable since it is only bad in totally black screens. And even with that, this adapter is definitely better than the ST2VGAr4 that I got from Centuriantech with regards to the lines. Also am using a backup STE since my main STE is out of service atm for recapping and reworking of a couple other issues so when that gets back up and running maybe the situation will be better with it.
I guess the only foolproof solution would be something with a framebuffer. Does the RGB2HDMI use one of those?