Look at the maths, even if every single tick of Sear procced, the damage would be doubled. Doesn't take a genius to figure out (1722.5)*2 < 4356.
This is how absurdly weak Sear is at the moment.
The only reason (that I can think of) that Mind Sear is currently as weak as it is, is because it can keep a higher uptime on the targets (assuming neatly stacked and targeting tank) and thus would 'apparently' make up for the difference. But, in my opinion at least, this is just a weak argument as the damage is just too low.