I ruled out the HDMI cable as the culprit, it’s brand new and all SNES games I’ve tested look great and don’t give me any problems other than Super Ghouls N’ Ghosts. I also ruled out my existing cables because they have been working fine with my previous setup with absolutely no problems.
I cycled through all of the different retrotink modes many times to see if I could get the picture to look normal. I also played with settings on my TV to see if that might be the problem, but my TV has always accepted a wide range of resolutions including 240p and weird refresh rates with no problems (Samsung UN32F5500) .
As far as power supply, I’m using a Samsung 2 amp phone charger, one thing I might test is another micro USB cord though now that I think about it, as it is a rather thin gauge and long. I’ll report back.