Post pictures of your adapters.
Things to consider:
1- Wii outputs 480p in Progressive Mode. It's higher than 480i.
2- Most TVs won't/can't upscale 480p anymore. Most TVs today won't even bother to upscale 480p to whatever you're using.
3- Your TV must have Component inputs (Green, Blue and Red) in order to use Component cables. This method is the best your Wii will ever look. The picture quality will depend on your TV's upscaler. IT'S A TV ISSUE.
4- If you want to "make it look HD" use a FullHD TV or a 1080p TV/Monitor. Beyond that and you'll get a "not HD picture" because of the built-in upscalers. And use Component, any kind of converters/adapters will inevitably add noise to the picture quality.