Not pushing off the back foot, but connecting to the ground through the back foot, allowing the back hip to open as the front hip closes and you move forward without rising or falling... If that makes any sense...
Works for me and is how I think....... But a whole lot of pushing off the back foot goes on..... I see it all the time.
You know that Jack Dempsey used to drop from the front foot to generate his very powerful and effect jabs.... Interesting to figure out how he did that and how to make it work, if it fits, with what is being worked on now......