Well I tried to post it on the beta forums but it's giving me the old no beta account attached nonsense (Another European player here) which is strange since I posted on the forums fine a couple of months ago. I'll just dump it all here so that some one else can copy pasta it to the forums if they have access.
As I mentioned I used averaged damages taken using recount against a training dummy with no buffs except Seal of Righteousness and Retribution aura. I used only non-crit data so crit anomolies were less likely; this means that the extra 15% crit that crusader strike gets is not represented here, and thus the actual result is even more in crusader strike's favour. The maths is modelled on 3 CS/DS and the resulting TV (or 0.4 of a TV in the case of DS) to fairly represent holy power gain.
Templar's Verdict - 15212
Crusader Strike - 6360
Divine Storm - 2760
Seal of Righteousness - 995 x 3 = 2985
Seals of Command (Which strikes every target hit by the seal, not just the primary) - 518 x 3 = 1554
3 Crusader Strikes + 4 Seal of Righteousness + 4 Seals of Command + 1 Templar's Verdict:
(3 x 6360) + (4 x 2985) + (4 x 1554) + 15212 = 19080 + 11940 + 6216 + 15212 = 52448
So our goal damage for Divine Storm to reach is 52448.
Take away the damage dealt by 0.4 TVs:
52448 - (0.4 x 15212) = 46363.4
Take away the damage dealt by seals from the 0.4 TVs:
46363.4 - (0.4 x 2985) - (0.4 x 1554) = 44547.8
This gives us the damage that needs to be dealt by 3 divine storms in order to break even: 44547.8
Damage that needs to be dealt by each individual DS:
44547.8 / 3 = 14849.267
Dividing by the damage dealt to each target of DS gives us the number of enemies required to meet our target:
14849.267 / 2760 = 5.38 (to 3DP)
EDIT: Almost forgot to mention this data was gathered at level 85 in ilvl 359 epic gear with Ashkandi as the weapon. All the gear is just the character copy template stuff, gemmed and enchanted.
Bugged forums...Mhm! Maybe you can give it a shot on the live forums, anyway? Worth a try. Thanks for the data!