I think you made a solid choice to pass on a 30yrd shot on a moving deer. As other mentioned don't wait for the perfect shot, but the first good shot. I personally only shoot at moving deer if they are inside 20 yards, broadside (more or less), moving slow and steady and are relaxed. Any brush in the way is a no shot situation for me. With a bow I have missed several deer, wounded and lost 5 and have harvested about 30 (I keep a record at home but am at work so I don’t have the exact number). I can think of three poor shots that I recovered the deer. All three of those deer and 3 of the lost deer where moving when I shot at them. One of the other lost deer moved when I released and the other I was 17 and took a poor shot. One of the moving lost deer I hit a branch that I didn’t see while following the deer with my sights. I have taken, and most likely will again, several deer moving slowly in close, but feel your are increasing your odds of a poor hit. It seams to me you are basing your decision to shoot on a combination of your shooting skill and the quality of the shot presented. This is exactly the way you should be doing it. Every situation is different. Don’t wait for the perfect shot to develop to draw, I have kicked myself more than once for assuming a deer wasn’t going to stop and missing a brief shot opportunity. The key is not to be set on shooting an arrow once you draw. As mentioned by an earlier poster, pick a lane draw and get ready for the shot. If you feel good about the situation fire away, if you have reasonable doubt let him walk. I once passed a 35 yard moving shot at a 140ish buck (which is about as big a buck as I have ever taken) because he had been walking strait at me and suddenly turned. I drew back, but felt rushed and he was moving a little quicker than I liked. I had a reasonable chance at harvesting what may have been my biggest buck, but have never once felt bad about passing that shot.