Isn't that too much Cure #1? 5lbs/1tsp is usually quoted.
4 tsp cure #1 per 5 #'s of meat is usually reserved for dry curing where the meat is hung in a cooler for months.... the cure is usually added in intervals.. divide all the seasonings, spices, salt and cure into 3 equal packets.... rub into the meat at 10-15 day intervals.... so this process takes 20-30 days or so... As the nitrite dissipates, new nitrite is added to prevent bacterial spoilage along with the effects the salt has... Then the meat continues to hang in the cooler for the designated time duration.... this is a specific method that most of us don't use.. and 625 Ppm nitrite is the max allowed for the above method....
For the smaller cuts of meat like jerky/biltong, where the meat is less than 1" thick, and the curing time is less than 7 days, due to the thickness of the meat, I would stick with 1 tsp. / 5 #'s.....
Nitrite does dissipate over time, and temperatures above 130 ish degrees has a dissipating or reducing effect on the nitrite... Don't know how much, how fast or any of those parameters.... Just read it somewhere and there were no specifics...
To help us all out here..... The terminology used for curing meats etc. is, and can be, VERY confusing.... At times, it's difficult to tell which method is being discussed..... At least this old brain has some difficulty, separating the various methods, when they are being discussed....
Dave