For mutilate, in 3.2.2 BiS, with weapon swapping EP values are:
AP 1,00
ag 1,97
hit 1,72
haste 1,98
apen 1,36
crit 1,82
exp 1,92
Standard error of the the estimates is 0.06. So as I predicted from previous tests, AG and haste are just below AP.
Also I want to summarize what has been said about the value of 0.1 speed for IP and DP dagger.
IP DP
Combat 33 102
Mutilate 39 125
This is how you read this table. First of all, you want a fast dagger for both your IP/WP and DP daggers. However, sometimes you do not have such luxury. So, for mutilate, if you are faced with a choice of a faster dagger with lower stats vs more stats and a slower dagger for your deadly poison dagger, choosing a dagger 0.1 speed slower will be worthwhile if the slower dagger has 125 more dps worth of stats (again be aware of haste and hit stats, which can mitigate some of the difference). On the other hand it takes only 39 dps worth of stats to overcome 0.1 speed difference for your IP dagger.
What has not been said here is the translation of stats of the offhand into overall dps for IP and DP weapon. Since uptime of IP offhand is 70% for mutilate and uptime of WP offhand is 55% for combat, normally your best ilvl offhand should be your IP/WP weapon. However, if the speed of your best dagger is much faster, given that speed matters a lot more for the DP dagger, it's possible that at some level of difference in stats, you might end up putting your fastest dagger as your DP dagger despite the worse stats.