It is possible, though, to get a negative home test and still test positive at the lab if they are using a more stringent testing standard, am I correct?
Exactly what do you mean by 'more stringent testing standard' ? Please elaborate..

Just from what you've seen over the years, do you think it will help me at all that my daily use was light?
Regardless of how many different ways your question is rephrased, the answer is still the same: Theres no telling. Each persons body is different.

One other question - I know the last post in the dilution sticky says the aspirin step can be skipped but is there any harm in doing it anyway or do most people just go ahead and skip it.
It would be a wise move to skip it - particularly if passing a U/A is of any real importance to you. As the post stated, a second-generation EMIT screen was introduced to counter the interference issues that aspirin caused on its predecessor, the first generation EMIT screen. Since the guidelines in the sticky were created, the times, along with the rules of the game, had changed.