I tried this on my 1's as well and am having the same problem. I contacted angelus paint and I don't think its the weather, they told me that the temp should be above 40 degrees when drying. Are the 1's tight on your foot? My 1's are size 11 and i'm a 10.5 so the creases are much worse and they cause large cracks in the pa in on my toebox.
From my experience I realized that when painting, the paint covers the crease as if it is a flat surface when its not. So after everything is done drying and you start rocking the kicks, the surface on which the paint is o,n is bending so it only makes sense that the paint moves as well with it. Angelus paint is meant to endure bending but I think the creases on the toebox are too much for it. Looking at my 1's, they bend a lot when I pick up my foot to walk(due to the fact they aren't my size). The only thing I think that can help cure this is either.
a)Remove the creases with the ironing method (But creases can always come back)
b)buy a sneaker shield to prevent the shoe from flexing/creasing at the toebox, which wears down the paint.
c)Do Both