Bite the bullet and order a Crossbreed. My 30 is my carry gun and the holster makes it disappear. If not the Crossbreed, go with a Raven Concealment or maybe a Galco Kingtuc.
I carried a G30SF in a Comp-Tac Minotaur very well for quite a while. I now have experience with Theis IWB holster - love it. In fact it's on my belt right now with a CZ 75 Compact 9mm in it. My wife has a Mackenzie IWB for her Sig P238 HD and it works very well too. I would strongly recommend any of these holsters.