I suspect we might have to start thinking about grip specs, the same way we think about racquet specs. That is to say, a range of possible weights, with plus or minus four grams not that uncommon, which means we settle on averages anyways. I think it's awfully clever that Torres used the 4gram spread difference on his Wilson grips to balance his frames without using lead. Genius. I guess that's one upside.
LOL, I'm afraid that your suspicion will be well founded! Tennis QC is not so hot. But as long as lead tape stays true we'll be OK!