Speed = Power. And when your on the pads, accuracy and speed is more important than power.
I've done some recording, low quality phone camera and the circumstances didn't allow me to put anything special into the video because even though it's day there are people in the other room sleeping.
I also have my phone balanacing on my radiator >_> sorry for the crap angles and quality.
I will try again tonight when I can show technique when everyones out the house, have a guard up but I did rush it.
Best punch is my jab, My friend in sparring can't get past it, I'm also southpaw.