I use both Wait and Stay. For Kayla, wait usually means,"there's another command coming" like come, sit, stand. Stay means stay until I give you the release command ("break" is her release) or return to you.
I do not think you need to start over. My suggestion is that you start by giving both the wait and stay at the same time so she can associate the two words. And then start weaning the wait out with just the stay command being used. You would still use the wait from time to time.
And then start applying the practices you want associated specifically with the stay command. See the statue, be the statue...
Once you've got that piece (and it shouldn't take that long) you can start applying the practices you want to truly apply to the stay-be the statue, immobile, etc.
I do not think you need to start over. My suggestion is that you start by giving both the wait and stay at the same time so she can associate the two words. And then start weaning the wait out with just the stay command being used. You would still use the wait from time to time.
And then start applying the practices you want associated specifically with the stay command. See the statue, be the statue...
Once you've got that piece (and it shouldn't take that long) you can start applying the practices you want to truly apply to the stay-be the statue, immobile, etc.