I really appreciate your sharing your break in procedure. I think all too often we forget about breaking in, or wearing in, our shotguns. We routinely do that with high powered rifles and we would not think of carrying a duty gun or using a gun for self-protection without a break in period. When it comes to shotguns however, it's easy just to pick one up and expect it to work perfectly.
I've also found that most turkey chokes need a break in period to optimize their performance. I often suggest to readers that they do exactly what you did, shoot some inexpensive or "junk" shells through their new turkey choke. Shoot, clean, shoot, clean, etc. I've had many folks reply that their choke shot much better after this procedure.
One advantage of still target shooting and testing various shotshells is that you shoot many more shells than you might when you hunt. You start to see the effect that shooting many shells through a barrel or choke tube has. Some of my best shooting chokes and barrels are ones that have had hundreds of rounds shot through them.
"If he's out of range, it just means that he has another day and so do you."