I personally see running the football as a complete waste of time when the look the defense gives is a heavy front in order to stop the run. I would audible out of that every time to a pass. I really don't understand how 2nd and 8 is much easier to get than 2nd and 10?
Statistics show that a good QB completes 2 of every 3 passes. So it's almost a guarantee that you will complete 2 passes and those 2 passes will equal more than 10 yards.
What the Bills did from the K-Gun was they gave a pass look every play and the defense would drop in coverage and they would hand off to Thurman for an easy 5 yards. I would run in that situation. I would almost never run otherwise unless it was 4th and 1. That's my opinion and math's opinion.