If you want to avoid having your toes point downward do you move the cleat forward or back toward the heel of the shoe?

I was advised to move my cleats 3-5mm forward last month which I did. However, I rode a century yesterday and now have a touch of tendonitis in my right achilles tendon. I've suffered from a bout of this last year in my left leg and have never had any problems in my right leg. I did notice yesterday during the ride that my toes appeared to be pointing downward and I wonder if the change in cleat position has contributed to this.

Thanks in advance
Marcie