I would recommend this - Wilson Combat WCP365 XL Grip Module

I bought an Xmacro. I carry AIWB. I would consider myself slim (5'9" 175 lbs 33" waist). I found the macro grip hard to conceal in a tshirt (even with wedge and claw on holster). I then tried the Mirzon hybrid grip. I really like it. XL grip size and full rail for a light (if you choose). HOWEVER, that grip has a slightly rounded palm which makes releasing a magazine slightly slow as it gets stuck by the fat of my palm upon release. I read A LOT of reviews on the wilson combat XL grip. The Pros: GRIP SIZE, I have ever so slightly more distance to the trigger which feels better. TEXTURE, feels great in the hand, does not rub my stomach. BEAVERTAIL, its MUCH more rounded. Still sticks into my stomach, but not nearly as bad as the Mirzon. COMES WITH MAG RELEASE. The Cons: I had to buy an XL holster, My TLR 7sub won't mount (which is fine because I actually prefer the thinner and lighter weight in my pants), My 17 round extended mag (with the XL basepad) won't insert easily unless I remove 1 round. Overall, I find this grip the most comfortable in my hand of the 3 I have tried and it conceals as well as an XL.