agree.. technically the velocity should be constant and more or less is.. but the story estimates still establish the building blocks for this.. a story seems to need tasks and task estimates to make the overall story estimate more accurate. Tasks help to break up activities. alternative is to groom the story of course, then you're left with a larger list of stories to manage however, and taking care of that in turn eats into our PM team's velocity :)
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agree.. technically the velocity should be constant and more or less is.. but the story estimates still establish the building blocks for this.. a story seems to need tasks and task estimates to make the overall story estimate more accurate. Tasks help to break up activities. alternative is to groom the story of course, then you're left with a larger list of stories to manage however, and taking care of that in turn eats into our PM team's velocity :)
It sounds like your spending a lot of effort on estimating. I'd guess (I'm not there so probably incorrectly :-) that you've got some combination of:
a) stories being too big
b) stories having to much variation in size
c) doing time based estimation rather that relative estimates or story counting.