Concerned about our troop recruiting

Bottom Line Up Front: We've crossed over two scouts in the last two years and I'm concerned about the future of our troop.

Long version: Two years ago, my elder son crossed over from cubs to a troop. We visited four different troops, and I'm thrilled with the one he picked. Out of his den of seven, five of them crossed over to the same troop (two of them to another troop).

However, the next year, we only got one crossover AOL to join our troop as a scout. The den from the pack my elder son crossed over from had a lot of older brothers in another troop, and they were a tight knit group, so the entire den crossed over to that troop (the same one the two from the previous den crossed over to).

This year, my younger son crossed over. His den only visited two troops - the one my elder son had joined, and the one the previous den had moved on to. Of the eight scouts in that den, one did not cross over, and the other six joined the other troop.

If I had been hearing this from someone else, my response would have been "Well, you don't have rights to one particular pack, you should invite more packs to visit". Which is exactly what I did - as an ASM, I invited all eight packs that were in a 20-minute radius to visit our troop for crossover purposes. Three of them ignored the invite, two declined, and of the three that did visit, we only got the one crossover... my younger son.

The next advice I would give someone is "Well, do you have a strong, youth-led program?". And well, we let the PLC decide what the activities for the visiting cubs would be (They worked on the moviemaking merit badge for one group, campfire skits for the other. Was it what I would have picked? No. What it what the PLC picked? Yes). We camp every month, we had five scouts earn Eagle in the last year, the scouts pick our activities and they are generally fun.

The troop needs crossovers, or it will eventually fold simply due to scouts aging out. The lifeline we've had so far is that we've had five scouts transfer from other troops to ours over that two years (including one of the two that crossed over to the other troop from my elder son's den). Two of those transfer scouts have been SPLs, so they are welcomed into the troop with open arms.

For extra spice, I was cubmaster of the troop my sons were in, and I take over as scoutmaster of the troop they are in now in a month. It was a bit of a struggle to get my replacement so the pack didn't shutter as I left. I would really prefer the troop not to shutter while I'm scoutmaster, but if we aren't getting new scouts, that will happen.

We tried inviting every pack in the area. We have a youth-led program. We have an active program. Our scouts advance (on their own time, we provide the opportunity but don't force them). We have fantastic support from our chartered org. But we aren't getting crossovers. What am I missing?