Cron autotransition not working and when forced over enrolls

Using signup version 5.x-2.7:
Auto-transitioning isn't happening for me even on a fresh install. A cursory reading of the code didn't make it apparent how it is supposed to work so I added my own. Could someone please take a look at the patch for me. I wrote it for a system where cron runs every 5 minutes. (400 seconds seemed safe to me?)

Also the signup_status_auto_transition function was over-enrolling my classes and workshops so I changed it to be more like the code in views_handler_field_signup_status_limits.

Thank you for the useful module and thanks in advance for any help.