I'm surprised that you did not add any water. Adding 1 Quart of water for every 10-15lbs of meat is pretty standard. This helps the seasoning and cure fully mix and makes the stuffing a lot easier. I usually make 25 pound batches and use 2 Quarts of water.
Did you use any type of meat binder?
Using a meat binder such as Sure Gel or Soy Protein Blend will increase the protein, which helps to bind the fat and meat, increases moisture, and makes a smoother final product with a better texture and mouth feel.
I have just recently started using Sure Gel or Soy Protein and it really makes a big difference. I will not make any type of sausage without a meat binder anymore. I prefer the Sure Gel, but the Soy Protein works too if that is all you have access to.
This may also help with your wet sausage as well. Although I have not had any problems with wet sausage since purchasing my Jerky Dryer.
Since you are making summer sausage, I am assuming that you are using cure product like Sure Cure #1 or Tender Quick? If so, I would strongly recommend hanging your sausages in a cool dry place overnight and then smoke the next day.
I have a few rack systems that I have made for the garages at my house and my parents house where we process a lot of our sausage (pics attached). If you live where it has not started getting cold overnight yet, you can EST in your fridge for several days before smoking. I sometimes let my cured bacon dry for up to 5 days in my fridge uncovered before I cold smoke it.