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I don't think either of these too small/too large variations are really an issue unless you're constantly getting flats for some other reason.
In any case I have run lots of tires in this range and I've never had any issue or had to do any work to find tubes that are optimal fit.
Bontrager, Specialized, Giant, IIRC they all have tubes that cover this range and nearly every LBS has one of those brands & every time I need a tube any LBS I walk in has one that fits right. Usually it's a 700x28-32c size.
No need to overthink and try to get a boutique tube, just go get a tube from the LBS and be done with it.
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