I have a Nokia 1020 with the exact same issue. My solution is to use the custom alarm sound. I use the song Rebel Rouser by Dwayne Eddy, but any loud song will work. I do, I do, I do, or Gimme, Gimme, Gimme, both by Abba have very long, loud instrumental introductions which work very well for alarms. An additional side benefit is that the song alarm sounds play at least the entire 3 minute song and don't shut off after 5 to 30 seconds as some alarms do. Finally, you could easily get an mp3 of a loud alarm clock bell or a klaxon horn and use that as the custom alarm. Easily done and very effective as well.