The trend in HP went down as the trend for better "sound" went up.
My 1986 Shadow 700 has more power than the modern 1100s. This is because in 1986, Honda was designing bikes for performance. It turned out that the American market better preferred bikes that sounded better, so Honda de-tuned the engine, change the intake and exhausts, changed the compression ratios and engine timing so that you have a bike that sounds more powerful, yet makes less power.
Give the customer what they want.
Currently Running Stable:
2010 Honda NT700V
1986 Shadow 700
1986 Honda Trail 110 (Postie Bike)
1987 Honda Rebel 450
1973 Honda Mini Trail 50