Out of curiosity I slowed down Mount St. Helens to listen more closely to the rhythm of the vocals during the parts where it sounds like you're singing too many syllables over one beat (e.g. "and it's gonna be a" on beat 4 of measure 1). What it seems like you are consistently doing is having three accents during the beat ("AND it's GONna BE a"), but when I listened more closely you aren't doing a triplet feel over the beat, but rather, depending on the words in each particular occurrence, a 3-3-2, 3-2-3, or 2-3-3 pattern of 32nd notes (which fits better with the 16th note rhythms in the instruments than a triplet would). My question is: are you intentionally writing the melody with 32nd note syncopation like that?
generally i'd say if you are hearing it differently as a result of slowing it down, that's probably not the way i was thinking it. i was writing it according to the speed it is on normal play mode