The cheat is, you get on the phone and whine to Nominet like a stuck pig and they let you catch a few. Only kidding.
Or you just do this.
The DAC returns are not live, they are cached when you query it.
What you see returned from Nom has the same time on it as the results are cached.
But just before the name drops the time stamp on that query will update as the cache is flushed before it drops
When you see a different time returned, shout holy mother and fire a heavenly number of EPP requests every millisecond in order until you land a catch.
EPP request has a unique number that comes back from Nom ... so you can then tune your script to get every bloody poll number 10001 , 10002, 10003 and so on and so on