Why is my dough so sticky?

I'm trying to make hamburger buns but I wanted to make my own thing than copy a recipe so i have been experimenting with the ingredients. Right now I'm at:

250g flour

23g milk powder

152ml water

5g yeast

20g sugar

15ml oil

for 4 110g hamburger buns

Last time I made it it turned out pretty well but the dough is incredibly sticky and I didn't want to lower the hydration percent because it's already pretty low (60%) . I thought it might be the sugar making it sticky but i already lowered the amount ( I was using 25g).