The biggest advantage of more torque in the mid range is that you constantly are using it. Hp above 7K doesn't mean much to me as I never am up there. I have so much power running up the revs, I don't need to get that high.
Hp at high rpms is most useful in race bikes, but more torque and power 3K-6K is usable in all aspects of street riding. I tried a lighter weight flywheel which increased the max. Hp at upper rpms. I had them put the stock back in because the bike felt LESS powerful except once you were up to speed. D & D puts the lighter flywheels in their Triumph race bikes which are running high rpms all the time. My conclusion was that the flywheel actually decreased the torque at lower rpms.