I AGREE with slowing down the presentation of baits and bait presentation 100% especially if the bait is not producing results right away. I have had so many baits produce fish once I slow down the actions and presentations that were not producing in the first place. What I often do with wacky rig senkos is I will toss the senko out and then count to 30 seconds before I do ANYTHING at all with it. I tend to have great results doing this.
I DISAGREE with "slowing down" when it refers to staying with the same bait and presentation for longer periods of time if it is not working. If its not working quit using a losing tactic.