I might have had the same problem. It seemed for a bit that I was stuck at six feet static gapping. I've practiced more, and it definitely seems easier to gap six feet now. Don't know if I'm going farther now, haven't measured in a while.
i definitely try gaps that I might not even have seen before though. I'd say practice technique more than power/trying to get farther. Once its easier to get smaller gaps, you can start going bigger again perhaps?