This is exactly what happened to me! If you scroll back a few pages you’ll see this was my exact dilemma. I even gave up on GG, thinking they just weren’t for me, but I admire them so much and gave it another try. I am a 6 in every shoe. Sometimes in Tory Burch flip flops I’ll size up to a 6 1/2 but that’s it, every other time I am a 6. I bought a 36 Superstar GG from Nordstrom and wore them in my house and they were too big. I ordered a 35 and wore them in my home and I was in pain. I gave up.
Then a week passed and I realized I must have a pair of GG, it was no longer fun but an obsession. I ordered a pair on Rue La La in a 36 because the price was really good and I thought what the heck. I wore them without socks and they fit great! I think for me that was the problem, maybe for you too. My toes weren’t loving the no socks so I bought a bunch of toe socks at Target with grips on the bottom and they are the best thing, I think I bought every pair in my local Target. My heel slides up and down but it’s not a problem at all. I even wore them to my daughter’s orientation weekend at college and walked all over and felt great.
Since then I have ordered two more pairs from Farfetch and I’m happy and done. For now! I just love these shoes! And I was never a sneaker person before. They made me feel short but the GG make me feel tall because of the built in wedge. And very stylish!
Thank you for a detailed response! I’m going to try 40 again. Since they’re all individually made, there might be a slight variation. Enjoy yours