Personally I'd wait a week, then try live. If they miss on the first strike I'd take out the rodent and gas him with CO2, then try a fresh killed. Usually if they miss the first time they get all fired up and will take a fresh killed, and at that point it's easier to get them over to frozen thawed.
You can also try being a bit more aggressive in your feeding. I've never really touched the frozen thawed rodent to the snake this much but it seems to work good for this guy, he makes it look easy:
https://www.youtube.com/watch?v=QDNLD63_ndQ
The guy in the video also uses bigger rats than I'd ever use for that size snake. I usually try to use a rat or mouse that is about the same width as the biggest part of the snake.