Definitely go for the smaller size if at all in doubt. I was in the same boat in between two sizes. After the final bake the skate gave up a lot of space and I could have gone with the .5 smaller. For me the feeling with the skate between the fitting bake and final bake was like night and day with the size and fit difference.
The toe cap itself didn't stretch being plastic, as mentioned here before, but the padding in the cap. I like my toes right at the cap and it's the only regret I have with the skates. Otherwise they've been perfect. In fact, the regret about the .5 size down has been so big that I've constantly been looking for deals to get a second pair in the smaller size 😆