I can't figure out how to fix this,
try this simple test, if you will,
paint a simple stroke of aurora (under glows) on the grid
now turn up the segments (under tubes>creation)
notice how the lengths shrink as you turn it up staring from one site to another? it renders that way too. I've tried many settings to try to fix that, but the segments will always cut out at the begining of the curve.
BTW I'm using maya 8.