Hey!
Another American angler here. Old thread but I thought I would reply in case it helps someone.
I am in the very bottom of America, and turtles in isolation are incredibly cool animals.
However, in fishing context, I have become convinced they are relentless hell beasts that serve satan.
That being said, there are some things you can do to slow them down. Do not use any marine proteins or any proteins at all for that matter. For flavors only use fruit,sweet things like caramel etc and grains. I use fermented feed corn with oats as a pack bait. I use fake sinking corn as the hook bait, as when they do find it they can’t chew it apart. I also use flavored tiger nuts I make (banana,anise,chili). They can crunch them but usually leave them alone.
Good luck