Every plant i've pinched off or cut back has always grown back to triple the size it was before i did. I did this with my bhuts and they're now producing ALOT, but my dumb luck is that it's too late in the season and i won't have but a few ripe fruits.
So yes, pinch it back. If it were me, i'd just cut the first 2-3inches off the top. It'll grow back. The plant looks very happy and healthy.
Example, if i don't pinch back my basil, it produces like crap. If i do pinch it, i get quadruple the volume i would have if i didn't.