One other thing for people to chew on. I believe it was the paraglider folks who solved for this leeching thing in a very different way. They instituted 15-minute start time windows. Your start time is rounded back to the nearest quarter-hour. This leads to pilots starting in packs every 15 minutes. If you start 5 minutes late to try to catch the pack you get no credit for the later start time, so there's no benefit. If you can make up 15 minutes on the pack in front of you, well good for you. I don't know if everyone tends to leave at once or if it splits the field up nicely.

Worth pondering. It doesn't just solve for electronic leeching, it solves for the eyeball type too.

9B