I recently purchased the Baratza Encore ESP. Today was my first time attempting to use it and I ran into frequent issues while trying to pull shots. I am using a really light roast (Onyx Colombia) and have struggled trying to dial in the beans. I started at a 15 grind size and ended at 3. All of the shots I pulled were fairly similar, sour, about 20 second extraction, and obviously watery. It did not seem that channeling was the issue and I feel that the grinder might be at fault. (I have used the Breville grinder for other beans and have had no problems dialing in).
Has anyone has a similiar issue with this grinder, and what should I do to fix it? Could it be that the roast is just too light to properly dial in? (I'm newer to espresso, so I would appreciate any advice.)