If your Taylors with medium gauge strings are too hard to play, it may well be a setup issue. Because the amplitude of a medium-gauge string's vibration is lower than that of a lighter gauge string, mediums can be set closer to the frets before the onset of buzzing.
I had an LKSM-6, a jumbo guitar that comes with medium gauge strings, that was more difficult to play than my grand auditorium guitars so I took it to a well-known guitar technician to have it set up for lights. He talked me out of it and asked me to allow him to improve the action for mediums. My LKSM-6 was set up to factory specifications but by filing the frets to tighter tolerances, he was able to lower the action significantly and I was very happy with the result. I subsequently found it easier to play than many light-gauge-strung guitars I've played in stores but I still had the meatier tone of medium gauge strings.
Stringing a grand symphony with light gauge strings will result in a thinner tone and less volume but possibly slightly more sustain.
Some people like the result, some don't.