All the above recommendations are very well written. The only thing I feel I can add is to start calling the boys when they stop coming,,Don't wait,,Start with we missed your son Johnny last night and I just wanted to let you know what we did so we can keep him current with what the boys are doing, If 2 meetings go by another friendly light conversation may give you the answer you need. I have never experienced a drop out without full understanding as to why. If they went to another unit I wish them happiness and a great Scouting future. If they got involved in a sport and didn't think they could handle both, I tell them we are very used to boys arriving late due to sports games or practices, to the point of they are welcomed when they come in and understand they get a big hey bud and get right down to work.
If I have one that seems unwilling to tell us why, I just point out that if there was any problem that was experienced involving a leader or scout that they please enlighten me because always trying to inprove, if something has not been brought to my attention, I certainly want to know what it is so I can fix it!
The last idea I have for you is with my Pack, I always recruited my Scouts and leaders mostly from School nights and made a BIG habit of recruiting really outgoing individuals most importantly with my Tigers. Getting a great base of Tiger leaders, I encouraged them to grow rank with their boys and every year I sadly lost Webelo II leaders to the Troop. It was good for the troop, and the next year I started all over again. Having your Tiger parents with the boys also gives you time to get to know which parents would make additional dynamic leaders for all levels.
Good luck..retention is one of the hardest things to do, but with good planning and good communication, you'll do just fine.
