The 9mm is 8+1 and 7+1 too. I hate the 7+1 mag though because I can't get a good grip on it. But yeah, the slim width is the reason I bought it. Really like it.
For the past month I have been carrying every day with a cheap Blackhawk cloth IWB holster. I found it to be very comfortable, and fit nicely at my 3:30 position. I bought that while I was waiting for my Alien Gear holster that I ordered. It took 5 weeks to get the Alien Gear, and it finally came in this past weekend. After getting so used to that Blackhawk holster (which had almost zero bulk), I am finding the Alien Gear to be hard to adjust to. For one thing, it has a lot of bulk in comparison. And because of the design of it, I have to wear it in the 5 o'clock position (which I'm not used to and doesn't feel as comfortable to me). On the plus side, it does not print at all with this. The Blackhawk had a small amount of print- if you were looking for it, you could tell. But with this Alien Gear, the gun & holster are invisible. So for that one reason, I'm going to wear it for a while and see if I can warm up to the way it fits.
So here is an update:
I mis-typed in my original post. The .40 is 7+1 and 6+1. And yes the short mag does cause me problems due to the length. It mostly only affects my ability for a strong grasp for my draw rather than when I'm actually shooting.
I currently have a Blackhawk (probably the same as yours) holster, DeSantis Tuck-This, and a Raven Concealment Vanguard II (Full Kit) holster for the shield.
I totally agree with your issue with printing and bulk. With that being said:
The Raven Concealment Vanguard II - Full Kit holster is incredible! I literally wear normal (tight-ish) t-shirts and literally ZERO printing. On a side note I appendix carry and the Vanguard holster is also tuckable. I am 5'7" about 165 lbs (starting to get a craft beer gut lol).
VERY IMPORTANT: The Vanguard holster does not fit the Shield specifically. It was actually my complaint that got Raven Concealment to update their website (only fits full size and compact versions - does not fit Shield or Bodyguard). However, I did a very simple modification to the holster and it now fits perfect with good retention. Give it a look and maybe that will help you in your case. I use the DeSantis holster now as my in-car holster for longer trips.
Don't forget to get a vehicle safe to properly secure your firearm for those occasions you have to go in to a post office, library, etc.