I remember a post where you were mentioning that the one of the important factors in doing damage was the activation times of the powers involved.
While I can see that DM's base 2 skills have short activation times, I was also noting that it's very comparable to the activation times that Stone Melee (SM) has for it's powers. In addition the brawl index lists higher for most comparable attacks. If the powers for both sets are slotted for damage in the same manner wouldn't that put SM at a higher damage/time ratio than DM?
Of course the above question ignores certain other factors such as the utility aspect that DM provides (accuracy debuff) or the resistances involved. I'm also not sure how knockdowns/backs play in PvP or PvE in later game so I'm wondering if you have any insights into how it compares later on.
I ended deciding to try pairing SM with INV because of the accuracy bonus in invincibilty. I think this would allow me to slot the attack powers with end redux and recharges to make it more viable as a speed/continuous attack string with a high damage output.
One other note I'd like to add is that SM also seems to becomes more feasible in the context of a group which has some members who can contribute to increasing endurance regeneration. Whereas an offensive set which is end efficient doesn't fully utilize this.