It seems to be a general rule that the bigger an airtime hill is, the worse the airtime. Thats why Exp GeForce, S:ROS and Goliath at Walibi World are better for airtime than Millennium Force and Stealth's airtime seems to be impressing people whereas Kingda Ka's hasnt apparently.
I also think Kingda ka is better the way it is, but it definately looks more intense with two hills. can you imagine the mounts of airtime on the first hill? It's so small for a train travelling way over 100mph.
I think that they made a good choice to stick with the 1 larger airtime hill. Sure, two would be nice, but for the smaller airtime hill in the first picture, it looks like it could be fairly intense, and with two, it might take away the main part of the ride, which would be the launch and top hat concept.
Yeah those two airtime hills would have been way too intense. Especially the way that they are, the smaller hill in front. I dont think they would design it that way, cause anyone with a lick of sense would see that those force on the first hill would be deadly. But I like it a lot better the way it is. And you still get pretty decent air. Rides like KK and TTD arent supposed to be airtime machines either. They're realy there to provide a growht in ticket sales and promote the park. To put the park on the map. And to provide a quick thrill, something terrifying and fulling.