Advice to "grip the tank with" is good for short hauls, but tensing any part of your body on 300, 400 mile rides is a quick way to end up sore or worse.
Relaxed is the way to go.
I've found my LSL setup is very relaxing. The bike still handles great, I just am sitting in a relaxed position. So I get less tired at the end of a long day riding. This is why I liked my ZX11 so much, she wasn't a racebike-wannabe like the ZX14.
Kawasaki messed up the ergonomics on the ZX14 big time. It isn't going to be raced except maybe on a drag strip. So who needs a racer's tuck on such a machine. The older big dogs had more relaxed handlebars on them, and we had just as much fun on them as you can have hunched over on the ZX14 without the soreness or being tired after riding all day, sun up to dusk.
Of course, K didn't bring the Concours grips up or back enough either. Nobody I know with one, which is about 20 or so of them) wants to learn forward at all. Almost all complain.
Before you kids say "it doesn't bother me", it didn't bother me 30 years ago either. I was doing nines with a street legal Z1 which had rearsets and clipons in the mid 70s. I rode that bike all the way to the south tip of Florida from Ft. Benning, Georgia once. And it didn't bother me.
But I would have been a lot more comfortable if I had left the stock handlebars alone.
Living the Gypsy Life