Could your stronger focus on lyrics be what creates that difference?
i might be focusing on the lyrics slightly more than you might be, but i also focus on lyrics less than someone who writes lyrics first with no melody. i almost never do that. so in that sense i am somewhere in the middle. lyric/melody are linked for me, and that package is usually the driving force, but sometimes i do things differently. sometimes a vamp will be the first thing. sometimes a melody (no lyric) will be the first thing. occasionally lyric with no melody will be first, but that's only when i'm playing a ridiculous game i call "title first", and that's just for the title