Problems with Blade Nano QX 3D Replacement Motors

We recently got a Blade Nano QX 3D and it’s really quite cool. However, after not really very much flight, and no poor treatment, we had to get replacement motors as one of them just stopped working.

I got official replacements from a local hobby store, but they seem… weaker. We tried both new motors in the front right spot. The motor works but the help can’t get off the ground anymore.

Anyone have ideas on how we can resolve this?