You're still using the .51 demo if you've got 70kt damage per armor component. That's very high and out of proportion. The .56 demo has much less value for armor and higher value for shields. You would find the warhead more valuable in that demo. In the final release, of course, you can adjust things as you see fit.
It's easy to add some power to the warhead and make it work the way you expect. And then it's easy to go back and change something else to correct game balance if you find it too powerful.