Brian E........
I always use the store bought stuff(much easier), but put different seasonings on it. If you use the store bought stuff, you will need to soak it for about 2-4 hours and change the water every 30 minutes.
I do about 100lbs. of these every year. Early on I would cook to a lower temp....150-160? and every single one came out tough.
I now take every one of them to 190+?. Unless you have a deli slicer, 165? will always be tough. To soften that collagen you need time in the zone and that is between 150-180?.
Not sure about curing also tenderizing....I don't have enough experience with that. I can repeat I have done tons of these and every one needs the higher temp to be tender.
Since most homes do not have a deli slicer and it is extrememly hard to slice that thin with a knife, you are much better off taking it up to 190?+. As long as you don't go too high, you will have the same texure as the deli stuff.
Most folks boil this stuff for quite a while....usually until they can twist a fork in it. That is how they get it tender and I am willing to bet the temps are above 165?.