I am also a horrible judge of distance, and have passed on shots because I thought they were too far, only to find out they were right in range for my best shooting. I guess my motto that I carry with me into the stand and everywhere I go is "rather be safe than sorry". I misjudged the yardage on a 160 class (approx.) a week ago tomorrow, I coulda made the shot if I woulda had a correct yardage on it, just woulda aimed higher. The shot was a perfect placement, but shot low, right under him.

I would suggest stepping all of your shooting lanes off and marking them with color coded (according to your pin colors) markers. This way there is no question on which pin to use or what yardage the animal is at. If it is past a marker, you know it's out of range. If it is in between markers, you know to allow for that, if it is right on, there is no guesswork, apply the appropriate pin to a couple of little brown hairs in the kill zone and take it down.

Good luck, hopefully you will get some more time to look for him, sounds like a decent hit to me.