Trail and error was I had to do. I finally found a holster that I thought was comfortable and concealed well. I bought the crossbreed supertuck but it met an untimely demise. I now am waiting on a MTAC holster ( Inside Waistband Holsters - ). Right now I am using a brandless singlehook IWB until the MTAC arrives. You may try going up one size on your shirts and trying patterns versus solid t's. If its not blistering hot maybe even an over shirt.
Some holster are adjustable to sit deeper in your waistband are ride higher play. Some have adjustable cants and some have both. There are many listed right at the top of the page as sponsors