Hmm... I'm quite sure it was mentioned somewhere that resists are not delay adjusted. However since I can't find any written proof whatsoever on this, I should take what is implied by the original post and assume that resists are added directly to your armor value.
The fact that alacrity lessens your damage per hit but increases overall DPS cannot be disputed, it is the very nature of the damage formula. But seeing your observations run counter to this, it could be the adjustment numbers are large enough to make the real impact of alacrity indiscernible.
Additionally, we don't have details on two other damage adjustments, The "X-Y damage (delay adjusted" and proc damage. How is the additional delay adjusted damage exactly delay adjusted, and how proc damage is added? Seeing the latter is always expressed as a separate damage report suggests it is not directly added to weapon damage, but rather separately compared to mob armor. I suppose it uses the originating attack's delay form calculation purposes.