This is what the I24 patch notes say: "Blast Set Nuke powers are being adjusted. The endurance crash is being removed and recharge is being decreased. Damage is being normalized, average damage will go down a bit but the damage is now (mostly) a fixed amount rather than a number of "chance to damage" ticks." I can't find pre-I24 power data (Red Tomax was archived as of I24), but my recollection is that the "chance to damage" ticks had nothing to do with a mob's distance from the center of the AoE. Rather, each mob in the AoE that passed the tohit check had a 100% chance for x damage and a lower % chance for additional damage. I would not be in favor of returning to that construct (and I certainly would not support reverting the recharge or endurance crash).