Rye bread in bread machine - crust very rough on top

This is what I’m using for my rye bread in the bread machine. Overall it’s tasty and rises okay, but the top sinks a little bit, and is really rough.

1 ⅓ warmish water 
1.5 cups regular flour  
1.5 cups rye flour 
1 tablespoon fennel  
1 teaspoon salt
1 teaspoon yeast 

I’m not using a heatlamp, the bread machine model is the
Breadman 2 lb Professional Bread Maker, Stainless Steel, BK1050S (about a month old). The temperature in the house now probably ranges from 67 to 69. I have it on the regular white bread setting in the bread machine.

Any thoughts? Here’s a photo – https://imgur.com/a/tU70DRw