Hello,
First, you are using a very old DDWrt build. I suggest you upgrade to build 22118, which is a known stable build. Make sure you reset the settings during upgrade.
You should also use a shorter SSID, it may be a bug, but it can stop the hotspot from working.
Last, you should turn off the DHCP service. Otherwise your settings seem good.
One way you can check if the hotspot is running is by telnetting in and issuing the “top”command. If you see a process called chilli run that’s a good sign. The router must have internet connection for this to run.