If you really believe your story is FP-worthy and it doesn't make it the first time around, I suggest you delete the original post and resubmit it a few hours later.
Spamming would be spamming. Reposting once is not spamming.
I think people have different incentives. If you spent time hacking together something and want to share it, I think you'd be more likely to think your story FP-worthy. If you're just submitting something that you read, much less so.
Or resubmit from deeper fathoms of the omnivorous echoplex.
Although... HN never rewards reposters, I mean never. If it has already been submitted from a different site it won't get a single upvote, ever. Well maybe not ever, but extremely rarely, but that's because the community is not very fragmented.
I'd disagree with that. In terms of who is browsing the site now, versus 4 hours from now, it is very much fragmented. If you make the frontpage, it's likely you'll be viewed by a large enough portion of the community to be punished for reposting. If you don't reach the frontpage, I think it's OK to delete and try again.