I am currenty having some difficulties with the single t. We first started with forcing to the pile with no issues. She was running anywhere from fifty yards to one hundred to the pile. She knows her directions with casting but every time I send her from side or in front of me she is trying anticipate the whistle. We went back to force to the pile with no issues. Went back to the single t and if whistle is in my mouth or.she here's it go up she will pop. Any suggestions to work through this issue. She always gets plenty of backs without a whistle. It's like she is thinking to much.