32 ounce bag

Make it without MSG for a ballpark 1939(ish) clone attempt. Or if you are averse to the use of MSG.  Bag = 26 ounce.

Make it with MSG for a ballpark 1955(ish) clone attempt. Bag = 32 ounce.

And lastly, fully scaled to 25 pounds of Flour (in ounces)

400. ounces Flour
60.0 ounces Salt (or to your comfort level)
-------------
6.00 ounces MSG [12]
9.50 ounces Black Pepper(s) [1]
6.25 ounces White Pepper [2]
2.25 ounces Coriander [3]
2.25 ounces Ginger [4]
2.25 ounces Allspice [5]
1.50 ounces Sage [6]
1.00 ounces Anise Seed [7]
0.25 ounces Thyme [8]
0.25 ounces Marjoram [9]
0.25 ounces Mace [10]
0.25 ounces Garlic Powder [11]

Sum below dashed line = 32 ounces
11 H&S sum = 26 ounces

1) It's got the nominal heat level of the Dustin recipe that Glen appreciated
2) It's fully 26 ounce bag compliant as to the actual 11 H&S
3) It's fully 32 ounce bag compliant after the addition of famous ingredient #12 (MSG)
4) It's got Allspice
5) It's pre-Savory
6) It's logical for weight in ounces

the other Potential is:

Both Herbs and Spices are Equal amounts neither higher then the other.

Therefore Herb goes before Spice as rule of Alphabetical becomes the typical listing method 

Very possible flg, but unfortunately we will never know the mind of the circa 1939-1950's Colonel Harland Sanders.

As to label ordering on the box, since the recipe was never revealed, even within a patent (for which there is none), the ingredients can be order listed however CHS (and later, KFC) desire(d) to order-wise list them. No one can challenge this, as any challenge would require a factually accurate knowledge of the recipe. And even courts have no access to the recipe.

This may be why the orders and revealed ingredients list seemed (and seems) to change periodically over time. It's all a mirage with intent to confuse replicating efforts.