hey man, I am sorry I didn't see this post earlier.
I dont wear new balance or clarks, unfortunately. I generally take a US 9.5 in nike and adidas sneakers.
In Aledn trubalance and barrie lasts, I take an 8D. In MA+ and carpe diem, I take a 40. In guidi, a 42. Like I say in the OP, this are a full size too big for me.