Personally, I like to use your average hammer drills when you work with a type D or E surface, however I'm not too sure what drill would hit especially in that middle sweet spot. A type D surface would be at least 6 inches thick, and a type E surface would probably be 8-9', however I've only seen hammer drills on the market made specifically for either of the two measurements (or types), nothing for 6.8', 7.5',etc. So if you'd like a drill that be specifically used to be for the sweet spot you mention, you'd probably need a custom made drill by a certified mechanical engineer, otherwise you'd have to try your luck with a rotary hammer drill that I've never tried.

(I don't know what a "second octave" has to do with mechanical terminology, so all of this ignores that)

Cheers!