I just assumed you sang the bass part in your native language.
I've never been a fan of Roto Toms, but in this context they sound great! I'd try throwing some long reverb on them for grins, to see if they don't take on a kind of a "wasting away the hours that make up a dull day..." vibe. You could automate it so it doesn't clutter up the fast parts.
EDIT: after typing that I went to the page and saw that they were in fact tuned to "Time".