Yeah, that’s expected Retell doesn’t really expose full control over the STT model, so you’re mostly on their default unless you go a bit more custom with the setup.
I can help you properly tune this though, especially around handling phone audio + accents and improving the correction layer so it’s much more reliable.
If you’re open to it, feel free to DM me I can take a closer look at your setup and help you dial it in properly.