When you say it's an arch top with a "simple" bridge, does the bridge float? Does it just sit on top the guitar w/only the pressure of the strings keeping it on? I'd have to think if it does, and in owning 15 years this wouldn't happen now, but perhaps the bridge shifted back on a recent string change lengthening the scale and thus increasing tension? I mean the intonation would be horrible so you'd HAVE to notice it.
Did this happen w/a recent string change as in fine before the new set, and after the new set it's tighter? If so, did you change brands? It could also be a mislabeled set. It could be you actually have mediums on it. If the answer to any of that is 'yes', then I'd go buy a new pack of the strings you've always used and put them on regardless of how old the strings are that you're dealing with now.
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