Okay, I've been labbing it out in the fight with 13 which is pretty consistent at generating tons of energy. 169 (13^2), 289 (17^2) and 361 (19^2) don't seem to do anything special. I at least thought that 19^2 would share 11^2's property of increasing the area of effect, but no, the range is still just 1 tile orthagonally. 343 (7^3) also seems to just do the standard 49 effect. It should be stated that it's possible these do have unique effects, and I may just not be meeting the conditions to even notice them. Like maybe 49*7 would have some further expanded cleansing effect that I am just not noticing because I am not being hit with the right effects to be cleansed.