Poke-Jo's is basically a beef sausage with some black pepper in it.
From the reading and sausage making I do, the "café grind" or 16 sieve black pepper and kosher salt performs better than anything else I have worked with.
I like you am working on a copy cat from another sausage maker in this area. You will become a lot more scale-able in your recipe if you convert to the percent ratio on all your measurements. The percent conversion is painful at first but the more I use it the easier it is to alter and "tune" a recipe. Lastly if you seem to be unable to get it just right, try some pork in the mix, the concoction I am working on (and have been for a couple years) is 80% beef and 20% pork, both meats are fresh ground, I usually use boston butt and chuck roast, nothing tastes as good as fresh ground. Good Luck, keep your experimental batches small and you will get there and also learn why no one completely gives the recipe up!!