Few things to consider. Best results, fresh not frozen meat. Water % is not an issue unless you have it so thin that during drying it will pull apart in places. Vinegar is not an issue. Here is the bottom line. Lean ground meat is the first issue. If you just have protien and no fat, meat has a bit of trouble binding protien fibers to protien fibers. Fat even as little as 10% during the mixing process acts as a molecular binder. Under mixing meat and spices will cause most of the "powdering". Temp. during mixing should be 42 degrees or colder. This will give you a fuller final texture and body. The meat and spices need to be mixed until you see a sheen on the mixture and a good general stickiness develops. Sticky so that if you grab a handful it doesn't drop from your hand when released. As for a cure just buy online sodium nitrate, not sodium nitrite. It's cheap and the same as Prague #1. Mix in at a rate of 4oz. per 100lbs of meat . Cooking temps are critical for food safety only. You can dry it without cooking at all if so desired. Strange things end up in ground meat which can kill you. So use the cure or cook it, one or the other or both.
Now here is your easy answer to your "falling apart" issue. (4% of the total weight add powdered milk or whey powder. ) Add it in your recipe with all ingredients and all your problems are gone. Whey or powdered milk are complex protiens and simulate fat and bind the protiens of the mixture to the spices and ground meat pieces. Add water (ice water) if the mix gets to thick to stir. People that post Youtube videos hold back info. for reasons I can't figure out. I am Smokin Mike, doing this for 45 years professionally and am happy to help you, Peace to you. Michael