It just wipes shit too quickly and reliably, please add delay to the plane. If you replace the ability with Tank hunter AT bombing that would also be a good enough nerf.
Replacing it with the PTAB bombing run would basically remove it from the game. There was a long discussion on this in the thread on Tank Hunters recently. The PTAB takes around 9 seconds to hit once the red smoke is down. Damage depends on the size of the tank, but seems to be 1/4 to 1/2 of the health of the tank, with 1/4 damage being far more common than 1/2 health damage. In the little bit of testing that I did, it didn't wipe a full health squad.
I couldn't find the change in the patch notes, but remember when it would almost one-shot a Tiger, and would wipe infantry in a large area. Some of the videos of that are still on YouTube. The old skill was a little over the top. It would almost kill an OKW truck in one shot.
I don't have a problem with the power of the Fragmentation bombing run. It should hit hard, but every other bombing run (besides the PTAB) has about a 3 second delay that seems to be missing.