I would suggest cutting your bars down in increments. And test any change you make to the bars out on your trails before deciding anything. Comfort is important, obviously, but you don't want your bars so narrow that you don't have any leverage for twists and turns.
As for saddles, I like a slightly longer nose on my mtb saddle than on my road bike. I tend to sit on the nose for certain climbs. I'm just using the stock saddle that came on my Santa Cruz, but I used a WTB saddle on a mtb trip in Utah that I really liked. You might check out their line of saddles.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher