The exact quantities of the components were established based on making 100 SPP/SRP per batch. The concept was make just enough dry mix for one batch and use it all up at once.
I note you are using the "hot" version of EPH-26 with more NC and less Ground Glass (GG) than the original.
Early on, I just mixed up a little more than I needed and saved the left over dry mix in a white plastic pill bottle. For all of the EPH-2x mixes, they a real close to 1/3 LN, 1/3 LH and then 1/3 of "everything else". Having LN and LH the same is important. People have experimented with different blends of the 1/3 of the "other stuff" - GG, NC & AL. I eventually settled on a very simple EPH-20 type mix where I started with 10 LN, 10 LH, 5 NC, 5 GG. I then made it even easier on myself and pre-mixed a bottle of 50% NC, 50% GG. Now when I get ready to assemble some final mix, all three items are just kept to equal weights. For an EPH-26 type mix you could "pre-mix" say 75 gr NC, 25 gr GG and 17 gr AL and then do your final mix with the same approach.
For 100 LPP, I have information that it will take 55 gr total. Lets say LRP takes 60 gr per hundred. Mixing up 60 gr (enough for 100) would just be 20 LN, 20 LH and 20 of the pre-mix "other stuff".
And by the way, your test fire sequence sounds very familiar. Even the planned "I know nothing, I know nothing at all" part.
On another note, one of the least "nailed down" aspects of EPH-2x is your NC powder. I am curious as to what powder and process are you using.