Looks too small.
Or more accurately short. DH bikes in larger sizes don't actually get less chuckable really, just longer. Lots of people seem to think they become XC bikes in large sizes, the companies might have thought of that….
Having said that, it's a DH bike, you won't develop knee/back/whatever problems riding one that's too small. So if it's fun to ride, then keep it? What do you expect to gain from a bigger one? Will it make you faster? Does this matter?
Unless you're replacing it anyway, in which case why not try some for size first?
(at a tall 6'4" when I finally got a properly big sized DH bike it was ace, more stretched out and in the bike. Less chuckable? Maybe, but compared to what? Compared to a short person on a smaller bike? No.)