Your guitar might prefer higher tension. I've owned two guitars that just preferred them. Anything lower felt and sounded too loose, but I could take those exact same strings and put them on another guitar I had and it would feel and sound too tight. My theory is that guitars with a stiffer soundboard prefer lower tension strings and guitars with a more flexible soundboard prefer high tension strings. This is why you can have two guitars with the same set up and same strings, yet they could feel completely different for both the right and left hand.
In other words, some guitars need high tension to drive the top, while other guitars seem to get choked up by high tension. Some guitars seem to need normal tension to vibrate more freely, while some guitars aren't being driven enough with normal tension. I don't know if this is actually what is happening, but this is what the player perceives.
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