The parens don't quite line up with how triplets are usually notated. This effectively prevents you from ending the composition with a triplet that loops properly.

You can hear it weird here: http://typedrummer.com/53d811

vs. without the triplets at the end, only in the middle, so less broken sounding: http://typedrummer.com/4x2977

EDIT: Ok, workaround: just put the first character in parens - http://typedrummer.com/hoxj64