Travis, you could be experiencing phantom knock, esp. if what you are experienceing doesn't happen all the time.
I have done EXTENSIVE datalogging on phantom knock. Here's what happens:
Cruising at 2.5-3.3k rpms. Hmmm, want to go faster...
Stomp on the fun pedal
Knock-sum goes to 43, timing gets pulled, car feels laboured, doesn't accel
Take foot off, and stomp again,
Knock-sum goes to 0, timing advances, and car kicks ass.
I have found the best solution to this is an immediate downshift to get the revs up, and then floor it.
If this doesn't describe your situation, then ignore this.
My latest suspicion is that turbo lag is a factor in phantom knock...... but at this point I'm merely speculating.