So if you want to use your #1 ability but you're currently on the #2 ability, you have to press your key 7 times to get back to #1? Seems kinda laborious. Why not just bind two keys or key combinations for "select left radial" and "select right radial" (Q and E by default) and use the number keys to select the ability you want to use? It's much faster. I rebound mine to shift+Q and shift+E, so for my right radial I just press shift+E if it's not already selected, then hit the number for the spell I want to cast.

Seems faster.