OK, my latest thoughts:
1. As others have said, do yourself a favor and forget about self checkout. Sometimes it works and sometimes they will treat you like a criminal.Go through the line and have them type it in.
2. Use 2 coupons per item per trip. Any more than that and people get suspicious.
3. In Atlanta, verified works at Kroger (see above). I spent 18.00 on a 67.00 bill, and 4.00 of that was almondmilk which I didn't use a coupon for.
4. Again, do not deviate from the coupon. If it has a picture of Lay's chips, Doritos or Tostito's, don't go down the rabbit hole of products made my Frito Lay that you don't expressly see on the coupon.
Don't try to get items for free. You MIGHT but that's not the norm and may set off red flags. Get sizes that will allow you a deep discount but still expect to pay something.