In addition to not sweating it, as described above...
If you're going to carry AIWB, it's even more critical that you have all your gear in line. A good belt, and the lowest-profile holster are going to be necessary to control the firearm. You really need to be able to keep tension through the beltline to hold the firearm tight against your body. You may find that one of the purpose-built holsters, with the claws, will help keep the heel of the grip against your abdomen to decrease printing. You'll also want to play with how high or low on you the firearm sits. The shape of your midsection, coupled with your posture, will also affect it. This is part of why so many folks buy so many different holsters, especially early on - figuring out all the variables of your body type and the firearm that you're carrying is going to take effort.
With that in mind, I wouldn't use the Alien Gear ShapeShift kit (or whatever it's called these days) at appendix. I'm sure it's fine for OWB, and it's probably fine IWB between 3 to 5 o'clock (7-9 on southpaws). There's just so much material there that I would never want to put between 11 and 1. Meanwhile, any of the modern Kydex rigs should put you in a better place - Tier1, BladeTec, Raven, the list goes on...