I'd put more pressure in the front tire. My michelin 28mm tubeless say 73 minimum, but I get by using 70 on my gauge, since I weigh 135-140.

Modern angular contact headset bearings need some preload on them. I don't use a torque wrench for such small amounts, but the only way to know that the preload is too great is when the front wheel doesn't automatically self-center after a turn. Also be sure that the top cap is not touching the steering tube and preventing preload from being applied.

I hit speeds of 48-54 mph on nearly every ride. I don't unweight the saddle or put my knees against the top tube. I pedal up to about 42, then get low with my hands in the drops and fingers ready to brake when there are curves ahead. Those deep profile wheels may be a problem. I refuse to use them, since strong cross winds are always a possibility. I have fulcrum racing 3 disc brake wheels on both of my bikes.