red1918sox2  Don't worry about the DA utilization.  If it was 10% before, it is still really ~10% now.  The way FAST VP background tasks are scheduled is planned to change with the next release.
Has anyone experienced the behavior where the backend ( VMAX 20K) gets very busy for up to 24+ hours after an upgrade to 5876.    We recently upgraded an array that averaged 10% util and spiked to 60-70% for 24+ hours.    
Enginuity 5875 -> 5876 Upgrade