Personally, I'd backup your current setup and start again with the official navcore 9.510 for a Go 730 because I suspect your files are a bit messed up.
Also, all of the ASR files should be contained in a folder called ASR...AFAIK there should be no asr.dat file in the root
Download the official TomTom navcore 9.510 from
[Please Register or Login to download file] TomTom's voice troubleshooting page is
[Please Register or Login to download file] There's a newer Europe map out now too: Europe 1005.8763