New Balance 550 sizing help

[makingmakingbaconpancakes]

I'm normally a 37, but whilst a 37 seems to fit nicely, my foot is lifting out of the back slightly when I walk. Tried a 36.5 amd they are much tighter on the toes, bordering on uncomfortable, but still my foot is lifting slightly when I walk. The lifting thing is both with and without socks so I assume its just the shape of the shoe.

Do they give much?

37 is the best fitting size but concerned if they give a lot they might end up just being too big.

Buy an in sole

I wear a 37 and as either side were too big/too small. I just lace them up a lot tighter, had them for a couple of months and they haven't 'give' and still feel snug

Thank you @Idontjetwashthefucker that's really helpful. It's just a bit odd because no matter which size I try (I've tried 3 different sizes), the slipping at the back seems to be the same even when the shoe feels too small, it must just be the shape.

@SkiingIsHeaven not bought an insole since my teens when I regularly wore too big shoes because they didn't have my size and I was desperate to have them! It might come to that though....