linguaphonic It is always best to apply the amount of cure per weight of each belly. I have no problem making batches of cure and using only what you need. But you need to weigh each piece and make sure you apply the exact amount of Sodium nitrite called for in the calculators
You didn't mention that you used only 1/3 of the mix using my calculations you are still over the max amounts of cure but just barely. Judgement call, you can probably save it but please be aware that when applying cures you need to be very careful with weights.