Hey, Seth, I haven't made summer sausage yet, but it's on my list when I bust out the grinder and stuff next.... I have had pretty good luck with the formulations from Len Poli, and have my eye on doing
THIS ONE.
Can you share more information on how you made your previous batch of summer sausage? Recipe? What temp did you cook it at? What kind of casings did you stuff into? I have found that LOW is better for any of my smoked sausage products. I aim for no higher than 180F, and try to start lower than that if I can. I've experimented with various snake setups with Kingsford in the WSM to make this happen, and it is doable. If you can keep it below 180F, then you will render MUCH less fat, and keep all of that goodness in your sausage.
While it is less appealing to the eye, a well made, wrinkly sausage will still taste great! Some things you can try to avoid the wrinkles......make sure you fill the casings well (of course, don't overfill!)
....and, the ice bath......make sure your bath is very cold, keep the sausages in there until then get down below 100F at least.
Share a bit more info on your previous attempt, and maybe those of us who have made a few links can help out!
R