your rankings seem mostly fine. absoutely normal to have karkat and vriska and terezi so high. also <3 nepeta ranking.
since i was born on the cusp, both terezi and vriska are my patron trolls ^___^
anyway, yes, the trolls appear in act 6 some. you might like aradia some more then, maybe not. i would consider her average more or less, but this is a ballin' song.
http://homestuck.bandcamp.com/track/temporal-shenanigans
basically, you can listen to pretty much all the homestuck musics now :p
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There is no shame in not knowing; the shame lies in not finding out