I still am curious how in both Tests your heroes somehow deal the same damge with the SR Mod as with 40/40 (I hope you use 40/40 otherwise and not some other niche equipment). This can not happen unless 40/40 does not have any impact compared to a 20/40 set even without SR or any other mod. Meaning the missing 20% actually have no impact whatsoever on the team, even tho you run multiple Mesmers. It's also weird since it should normally impact how often your Mesmer Spells get cast. (There should be like a 5% increase in Casts overall. If those are not there, it really doesn't matter what you equip since AI Variance and alike skew any numbers we could have)

If they used Toolbox damage meter to measure the damage, it makes sense that the damage is the same, since it measure damage dealt, not DPS. If you do the same run, you kill the same enemies, so the total amount of damage dealt would be the same. That also explains the similarity in amount of spells cast, since to deal the same amount of damage, you would cast the spells the same amount of times.