Ok, my internet at work went down almost instantly after posting this, sorry for not gettting back sooner.
I updated the day strong against notation. It is that the Day is strong against the Crystal to produce a -1.
For Eruntalon's example, and divisortheory's reply, yes all factors need to be considered, before you have a "X".
For factors you want to negate, or leave at zero, make sure you are not in one of the two deciding criteria. For days, if you are not in same day, or on the day stong against the crystal, or lights day, or darks day, I consider it to be zero effect. Similarly works for direction and moon phase.
So I produce the following formula:
Skill Cap (69) - My Skill (67) - (New moon + Darksday)
69 - 67 - (-2) = 4
The above is correct as long as the other factors such as direction and synth support are zero. BTW, in this instance I would personally want a "X" closer to 2 then 4, because of material costs and rarety.
Divisortheory, your calculations look perfect to skill up on Lizard Cesti to level 17. Now you just need to apply to the Actual criteria you find when online. You defiantely understand what I was saying.
I did provide in the initial post in the notes regarding moon phase, that the number to apply varies with each day, and gave an example. If the notation is says Full or New moon, I consider it a full +1 or -1 rather then the 95% and so on.
1) Moghouse elemental energy
I personally have not played with this as a factor.
With no elemental energy this factor would be 0.
It would be interesting to see how much of a factory this could play in crafting results.
2) Other days of the week besides Opposite / Same
Opposite, same, light, dark will all have numbers to apply, the rest I consider zero.
3) Other directions besides Opposite / Same
Similar to days, but since it is half as effective even at its strongest criteria, if the direction is not same or opposite, I consider it zero.
4) Other moon phases besides New / Half / Full
As stated moon is a fully variable number anywhere between -1, and +1.