If you want louder, you want heavier gauge.
However, acoustic is acoustic and not electric. String vibrations will never be equal to amps for volume. Also, be aware that the guitar projects outward and your ears are upward. Finally, be aware that by supporting the back with your body by having good posture and holding the guitar firmly against your midsection will improve projection of an acoustic guitar.
Heavier strings, good posture, firmly held guitar position. You'll get more volume. And a heavier gauge pick.
Also, quit playing in the midst of a hurricane or from the back of moving pickup trucks. That will quiet the wind noise some.
Granted B chord amnesty by King of the Mutants (Long live the king).
If it comes from the heart and you add a few beers... it'll be awesome! - Mekidsmom
When in doubt ... hats. - B.G. Dude