I would try a different cut shirt. I'm a little fella 5'6 145 lbs and I carry an all steel government size 1911 .45acp IWB with minor issue's with a t-shirt or polo shirt. Depending on the brand or cut of the shirt. Some fit's like a big medium and some like a small medium shirt. If the shirt fit you kinda snug, it's going to print pretty bad.