Here's the truth!
The 80 meter standard coil is actually better than the higher rated one. The reason is, the large end caps of the large coil adds a LOT of loss. The small coil will easily handle 500 watts, although Hustler will tell you it won't.
The surprising part of all of this, Hustler touts their high power coils by saying they have a wider bandwidth. The only way that can happen is if they have more loss. The large ones also have much more wind loading.
If you really want the cat's meow, replace the ATAS with the screwdriver antenna made over in Leeds (sorry, I don't remember the name of the outfit).