Use a temperature of 0. This will actually dynamically adjust the temperature for you depending on the confidence.
A low temperature like 0.1 has the highest chance of entering a loop.
The prompt shouldn’t be used for instructions (although I’ve seen people report that it works)
What you can do with the prompt is set the style and perform instructions through showing and not telling.
If you notice there are “uhmmms” and “uhhhs” in the transcript you could begin your prompt as:
“Welcome, this is the beginning of a formal transcript”
Or something along the lines of that