Originally Posted by Karmon
The anomaly of mutilate DPS with regards to changing talent points (most notably Imp.SnD) is due to an averaging of the possible cycles.
If you look at the rows 213/214, 228/229 and 243/244 in the cycle sheets (normaly hidden) you will see that this computes an average of the cycles that lie within 10% of the top DPS cycle.
These averages are then propagated back to the Unbuffed/BuffedDPs sheets.
What happens if you deselect Imp. Snd is that the other cycles fall outside the 10% margin; essential no averaging takes place an you see a higher DPS.
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As was pointed out to me when I raised this issue, it's basically because the sheet has to model specific cycles and it's simply that SnD cuts have not been modelled for Mutilate builds. As Improved Slice and Dice does not actually change the cycle the sheet simply assumes that the cycle takes longer (since SnD is up for longer). You'll notice the exact same thing happening when using the 2-piece Netherblade set bonus.
It will still give you the right gear/gemming info and you can simply cut SnD yourself and at worst you'll get no more dps than you would if you didn't take the talent.
Modelling Mutilate cycles is something that seems very difficult to do since the very nature of the build is that it is highly proc-dependant. You can have a 2-4s/4-5r cycle that could take take only 14 seconds to complete and yet generates up to 26 seconds of SnD time. The same cycle could either take 25 seconds to complete or only generate 18s of SnD (even with Improved SnD).
All things considered, the sheet does a damn fine job of modelling a very difficult-to-model talent build.