How exactly are you calculating your "maximum mana efficiency" cycle?
I've looked in calculations and you seem to be casting Scorch 80% of the time and AB 20%, 90% of the time, then AM 10% of the time (on clearcasts). Cursory examination of that tells me something is wrong since AM takes 3 times as long to cast as Scorch (so it should be more than 10%).
I modeled an AB, Scorch x4 cycle with AM on clearcasts, and tried to overlap AB.
This is what I got:
Lag Time 0.2
Stopcast Time 0.5
Scorch Scorch Scorch Scorch Scorch AM AM
Scorch Scorch Scorch Scorch AM Scorch Scorch
Scorch Scorch Scorch AM AB AB AM
Scorch Scorch AM AB AB
AB AM AB
AB
Scs 4 4 3 2 1 1 1
AMs 0 1 1 1 1 1 2
ABs 1 1 1 1 1 1 1
Sc Time 6.8 6.8 5.1 3.4 1.7 1.7 1.7
AM Time 0 5.7 5.7 5.7 5.7 5.7 11.4
AB Time 2.37 2.7 2.7 2.7 2.37 2.37 2.7
Total 9.17 15.2 13.5 11.8 9.77 9.77 15.8
Prob 0.9 0.9 0.9 0.9 0.9 0.1 0.1
0.9 0.9 0.9 0.9 0.1 1 1
0.9 0.9 0.9 0.1 1 0.9 0.1
0.9 0.9 0.1 1 1
0.9 0.1 1
1
59.049% 6.561% 7.290% 8.100% 9.000% 9.000% 1.000%
Average Scorch Time 5.43167 53%
Average AM Time 2.39120 23%
Average AB Time 2.44573 24%
Average Total Time 10.2686
IOW, the cycle you have modeled in the spreadsheet is waaaaay off. It's even more off if you use an ABx2, Scorchx3 cycle instead (the second AB could be more efficient in mana per second than scorch with certain builds).
Anyways, this would all be sort of fixable if the cycle builder allowed us to put Arcane Blast in, and also if there was a clearcast cycle builder specifically for modelling this sort of thing (like the mutilate cycle builder in the rogue sheet).
-sol