You need to stop what your doing and follow the manufacture directions. Too much cure can poison. you need to know what the nitrite amount is in the cure packet
You need to weigh the water and the meat then add the weights together then calculate how much cure to use. You can omit the manufacturers cure if the nitrite amount is unknown and add your own cure #1 as long as the PPM is correct by calculations. If the meat is thick you will need to inject. Like said you should not deviate from the manufactures instructions if its a pre packaged kit using the kits ingredients
My 2 cents
Your total weight should be 1075.36 grams water and meat. Now take your weight in grams x 200 (the ppm of cure #1 we are shooting for) / 1,000,000 / .0625 (the percentage of nitrite in Cure #1) = grams of Cure #1 to use. If you don't have a scale that can weigh in tenths of a gram, you can convert Cure #1 to teaspoons by dividing by 5.7.
1075x200 = 215,000
0.215/.0625=0.344 grams of cure#1
This is how I calculated it.... Can anyone check my calculation. I pretty sure its ok but not 100%