Guess I missed the part about it being opened up in 2011.
That you got the same basic results with the holley would make me look elsewhere. Even though you got the demon to work better you still have the same base issue, pre det.
You mentioned you had different results with the revinator I might poke around in that area, ignition I mean.

Since you like 'free' (so do I), have you tried playing with the plug gap and see if you can change anything?
I know a lot of guys claim bushwa on messing with the gap but you'll never convince me otherwise.
Too many times have I seen performance issues clear up by moving the gap around.
And yes, I've heard every reason why it doesn't matter before anyone feels the need to correct my way of thinking.

Don't know what the fight is about either, it's 'free' to play with it and costs the same amount to put it back.
Guys will pull apart everything else, spend dollar after dollar then kick and scream about tightening or opening the gap .005.