Slouchy. Now there's a word you don't hear describing the F6B too often.
I have never ridden a Concours, but I am guessing it is a higher-revving freewheeling horsepower monster.
Your flat-six Honda will not react the way your Kawi did...it is more of a "push" than a "pull". Lots of thrust, not arm-ripping, wheelie-popping power. It is a Cadillac Northstar V8 rather than a Civic Si with a 9000 rpm redline.
Have you rolled on the throttle hard in each gear? If so, are you still disappointed?