don't fool yourself into believing that a CF frame will provide a material increase in comfort. CF does a decent job dampening high frequency road vibration, which is why CF forks have a reputation for being softer. But it does not flex much more than a steel frame of similar quality. Comfort comes not from the frame, but the tires and saddle.
If the Trek can manage the tires you prefer and is good on other key respects, I suggest you work with that. You can possibly make it more comfortable wit fatter tires at lower pressure, and/or a limited travel shock seatpost if you feel it necessary.
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