You're not alone
But it's not only the alarm which I think is way too loud. At the lowest level, simply everything is much too loud. For example, during a phone call, I almost always hold the phone a few centimeters away from my ear, because the next lower volume level means "mute".
However, this is not a problem of LOS, since it is the same with the F3 in other ROMs. I think this is a firmware thing.
I tried a few firmware's without any luck.