hungfistron
Green Belt
I feel I get the most power from a forward moving lead straight or jab when using the push shuffle footwork - that is pushing off with the rear leg and trying to land the punch before my lead foot lands.
This may have been a given, but I thought I'd mention it just in case.
Sounds like you are doing it correctly, the way it was taught by Bruce thats why you feel it. Took me a while to understand this basic technique, and I'm still learning....