RE: How high do I need to go?
As for your height I'n sure you'll read alot of diffrent answers for that one but I would go twenty to twenty four feet.
As for your shooting distance ( yardage ) if that buck was directly below you at sixteen feet up you would have to use your ten yard pinband aim it a little lower.
If you thought that deer was twenty yards your wrong that twenty yards was really about ten or less straight down , the next time a deer is right below you and your sixteen to twenty feet up use your ten yard pin and aim low.
You'll be amazed how short of a distance it really is.