very dark crust with rye bread

very dark crust with rye bread

eI make to recipe a rye with rye in sponge only.  Baked at 450 first 12 min. and then 400 for 35 min.  interior temp was 190 to 200 when remove to cool.  the crust is a little too dark.  Should I bake at a lower temp for more time  ?

Source: Fresh Loaf