Geko,
It already is far worse than Clear Mind. It is interruptible, the casting time is long, you can't move while using it, and the range is very poor. It is next-to-impossible to use during combat, and its long duration is the only thing that made this power useful. 1 minute duration is an over-nerf, and absolutely cancels out the usefulness of this power. Up the duration, even to 2 minutes, and it will be fine. I understand that you need Clear Mind, etc. to be powerful, and if you look at all of the negatives of Stimulant, you'll see that it is. Power Pool powers should not be terrible, and yes, certainly should be less powerful than similar Primary/Secondary powers, but this change ruins this power.