Soul Drain: Soul Mastery vs Dark Mastery

Soul Drain in Mid's is showing a lot of difference for 2 versions of the same power for a Defender.

Red Tomax shows them being a lot more similar (almost identical, but..), but still shows twice the recharge for the Soul Mastery version.

Is this right? If it is right, does this make sense to anyone? Is it WAI?

i think its always been that way, why i have no idea, but the differences werent really noticeable until all ATs had access to APP and PPP

Yes, Soul Mastery's version of Soul Drain is really the nerfed version.

For verification you can use [Soul Mastery.Soul Drain][Dark Mastery.Soul Drain] in chat to see the differences in-game.

I24 Proc Chance = (Enhanced Recharge + Activation Time) * (Current PPM * 1.25) / 60*(1 + .75*(.15*Radius - 0.011*Radius*(360-Arc)/30))
Single Target Radius = 0. AoE Non-Cone Arc = 360.