You will be fine....I am a big guy and wouldn't have a problem with it. If it was something like 1.5-2.1 then my fat arse might get nervous.
The bigger it gets the thinner the tube will be as it expands....I want as little stretch as possible for me. I don't see a problem with your tube at all.
Supergo or Giant tubes (saw them at the Supergo shop in Seattle) had some 2.5ish tubes that were not DH specific but just a little thicker than a XC tube. They would be a good comprimise....if someone was looking for something like that.
I guess it depends on your tires too. Some are more prone to pinching than others.
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