I would rather get a dress shirt from Target. Express screams 'champagne taste with PBR budget' and for that reason they look cheap and poorly made.EXPRESS FOR MEN 1MX Slim Fit shirts.
I am 6'1 180 lbs and have always had the same problems you have had, Tried these shirts out and they are the best fit you will find on the market.
Watch out though as there are 3 different styles for the 1MX shirts they offer: Modern , Fitted and Extra Slim
The Extra Slim is what you are after.
They have darts put in the back from the store so they fit nice and close to your body and you wont look like your wearing a parachute like most store bought shirts.
If your going to buy express save the time and just get a fell fitting Ralph Lauren button up.