Lems Mesa way too small!!

Good evening guys

I have a predicament. I purchased some Lems, declined to keep the box from the store I got them from- I walked around in them for about an hour total and I am unable to return them. They don't fit :(

The balance and coordination is unparalleled. I love them, but I can tell they will easily hurt my feet if I walked in the half a day (only after buying and actually walking outside for a while). I seriously sat in the store, walked around, and jogged in place for about 15 minutes. And yes, I know it's my fault.

My question is-

I got the size 10 Mesa shoes. There was a very small amount of toe space longways (less than half an inch), and the toes were only touching the end of the shoe when I was moving. My feet were also falling off the sides a bit. I feel a 1cm increase and a wider toe box/mid foot would be sufficient

According to this official sizing chart, it seems the Primal 2 size 11 would provide me the wider midfoot, toe box, and OAL (overall length increas of 1cm) I am looking for. Would I be wrong for making this assumption?