I think I learned where the unusual issue came from with the "oil" seeping out of these even after cooling to room temp. These were sorta wet, like there was an unsaturated fat in them. Well, this was my first ever grind of beef, and it was entirely beef (all others were store bought beef, I assume also all beef). However, the fat I added to this chuck roast was fat I trimmed from a brisket I cooked many months back. (smoked / cooked in a my gas grill before buying a smoker). I had trimmed the fat to not more than 1/2" on the exterior, and inside that pocket where the fat goes really deep, that also got removed. All of it saved.
Fast forward to yesterday, and I had been told on here to watch Duncan Meyer on Youtube for his hot dog video. I did so, and then watched a few more. In his video about selecting meat for sausages, he mentions very briefly that you should avoid "body cavity fat" when selecting fat for your sausages because that fat, while plenty easy to render, has a lower melting point and will cause grease out. Now, for me it didn't cause grease out, but it does cause the snack sticks to be a bit wet when eating them at room temp in the summer.
Always learn'n... Who'da thunk it that that particular fat I saved could be an issue in these snack sticks... Like Mom used to say, "if it ain't one thing, it's two."