UPDATE - I got two of the studs out. I soaked the broken spline type studs on the one side with PB Blaster for about six hours or so. The two studs both popped right out with some light tapping from a five pound sledge. I am soaking one of the not broken studs now to see if it comes out as easy. I should really replace them all since they keep breaking.
Unfortunately, the studs on the other side that are a different design are a different story. Not coming loose at all. They are not splined so they have a lot more contact with the hub to corrode in place.