Oddley
It must be all of that "Fat BOY Dancing" that tires you out.
I have just asked Franco to review the 5.88 % vs 6.25 % figure and when I get an answer I am ready to post a Ham Brine Cure Recipe (using Spuddy's original posted recipe) to the site together with a lot more calculations and/or variants of one's that you've already seen.
Kind Regards
Parson Snows