There is no changes in dynamic skim at the latest builds, only 'feed' traffic was excluded from trade outs.
About your time condition - never use EXACT minute to start new rule, because in this minute cron man not be run. Use either '1-15' or even '*' to start at any minute, AND specify duration for all time you need.
For example, if you'll use
* 2 * * * duration 420
- new rule will start at ANY minute (first ones for sure) of 2nd hour, and will work for 420 minutes.