You first need to learn the metrics of shirting as you don't know them. Shirts give zero fucks about your height and weight. Shirts care about your chest measurement, your neck measurement and your sleeve measurement. This is probably why you are currently unhappy with CT as you are buying randomly vice specifically. I'd recommend you go to the closest CT location and get fitted and then try on an example of their fits to determine what you like.

Now if you live too far, another option is custom. https://www.moderntailor.com/ and https://www.itailor.com/designshirts/ being options though there are others.