Plate of Uxan Uldorath Divine Power

I was messing round with said plate on my aa (using emporium cloak with heavy armour prof), and it appears that although the hp buff from divine power drops after the 5 min buff ends, the Lbab increase continues through partial rests and relogs (not sure about death), only a full rest removed this effect. Additionally, the 2 (it should be 1 if its cast at CL50) extra attacks are also remaining.

Also the extra attacks were giving me attack progression
+104/+99/+94/+89/+104/+99/+104/+99.
Not sure if thats supposed to happen.