So you tell us, what EXACTLY do the two referenced SC rulings mean to you.
Both cases were limitations of the 2nd amendment. Miller indicated that the only class of weapon which could be protected under the 2nd amendment would be one of a militia-type. So a sawed off shotgun was not protected. Lewis dealt with an individual with a criminal background. Again, because such a person would not be in a militia, not protected. Both decisions were predicated upon the position of the SC that the purpose of the 2nd amendment was not to allow citizens to own any weapon they wished but rather for the state to maintain a well regulated militia. Neither of those decisions in any way restricted the authority of the state or federal governments in regulating those weapons. Both of those decisions were, in fact, affirmations of that authority.
In Heller, the SC actually did something of a reversal from previous rulings by indicating that while the purpose of the 2nd amendment was the militia, the state could not restrict the ownership of weapons to only the militia. However, the court was very careful in Heller to state that this did not mean the government did not have the right to prohibit that ownership in terms of weapons deemed dangerous and unusual. It was mute on what that meant and thus left that to the states to determine.
The only decision which in any way restricted the authority of the state to regulate was Heller, and in that case only to the extent that there could not be a complete ban of all weapons. Any interpretation beyond that requires reading language in those decisions which simply is not there.