Rod, you're missing the point.
A single PPD should do 5, 5, 5, 5 exactly as you stated from range 11-15.
The issue here is whether two PPD's fired together should do 5, 5, 5, 5, 5, 5, 5, 5 or 10, 10, 10, 10.
EAW 2.036 and OP 2.5.3.8 do the latter.
Only OP 2.5.4.10 does the former.
PPD's are getting an undocumented boost in this patch. Try playing a 3v3 while facing typically 6 PPD's on the ISC side. One combined PPD attack can do 24 volleys in just 4 seconds (ouch!). If Taldren wants to improve the PPD then that's great. I'm just pointing out that an unintentional change may have occured.
Dave?