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I am a large man and had the same problems several yaers ago. As stated above, a good gun belt and holster will do wonders. If you have to choose due to funds, I would go with the belt as you already have a holster.

The largest carry weapon that I use is my full size XD45, IWB in a Don Hume holster with a Don Hume gun belt. I also wear shirts that are (or were) 1 size larger. At times, there may be a slight printing but not enough to worry as I pass it off as my phone. I have other rigs for different guns (most of which are 1911's) but the XD is the largest.

Oh yeah, be sure to wear an under shirt to protect your skin as well as keeping sweat away from your weapon and holster.

Also, keep in mind that the carrying of a weapon is ment to be comforting, not comfotable. But there are options that make it more comfortable.