Americolor Super Red ... that's the answer! I switched from Wilton to Americolor about 8 months ago, and I am so glad I did it! You don't have to add nearly as much coloring, and you get the most brilliant red icing!!! 
Is this a brand that can only be purchased online or can you find it in a store?
Lots lots of coloring by the way good luck with your cake ka - chow!
I use only Wilton colors and had the very same problem with the red not being red enough.
I called my instructor and she said that sometimes it takes 24 hrs to darken up completely. So, I iced the cake and the next morning it was perfect!
But now after hearing about Americolor I'd like to find out where I can purchase it.
My local cake decorating supply store happens to carry it, as well as a few other stores around where I live. You don't need to use very much to get a true "red" (or even black using Americolor Super Black). Even when you first add some, your icing turns sort of a light red (if that makes sense) instead of pink.
If you can't find it locally, you can definitely order online.
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