Anyone know how long it takes for the plugs to show how the engine is running at the moment the ignition is cut? In other words, if I am having a hesitation when i mash the pedal, if I was to cut the ignition at that exact moment, would the plugs read right?

Thats how we tuned the dirt bikes. Just remember to let off the pedal at the same time, and put it in neutral. Don't be a Darwin candidate though, if you have a steering wheel lock, things can get fun. ( you have to test it under load )