First attempt at summer sausage possible problem

I mixed 80/20 deer and pork......4 pounds

Then added

1 1/2 teaspoon garlic powder

1 1/2 teaspoon coarse black pepper

2 1/2 teaspoons mustard seeds

1 1/2 teaspoons liquid smoke

2 teaspoons whole black peppercorns

1/2 cup jalapeños

A little over 3/4 teaspoons prague #1

I mixed it for about 5 minutes. It didny get gummy like I have seen while I studied the process.

Should I add non fat dairy milk? 1/2 cup maybe?

Thanks

Frank