Did the A-4 fail its run-on tests due to trampling?
The hook point is well aft of the MLG axle line - and the A-4 wheels don't deliver anything like the same energy to the wire.
It's not the shape of the hook, it's the ability of the hook to perform consistently in an off-nominal (wire flat on deck) engagement.
Not to say it can't be done, but it's not in the bag until it has been done.