Stopping the knock: Lower compression and ported heads...

I was running 11.5 to 1 with my kit. I ran 93 octane without issue. I also was also running a slightly more aggressive Voodoo can than the one you're running.

Read this again.

93 octane? I have 91 here. 2 points does make a difference.
11.5 with a more aggresive cam? Sorta sounds like a wash to me compared to mine.
I was at 11.0 using 91 octane.