I'll just drop this here with a summary and go to bed. I'll let you draw the conclusion here.



Simplified damage to average damage rather than depending on rotation. Used dragoon as base for buffs. Differences on picture are as follows:
With both time buffs
Without b4b: 9.49 DPS difference
With b4b: 1.03 DPS difference

With only Time dilation
Without b4b: 11.07 DPS difference
with b4b: 2.61 DPS difference

Without either
Without b4b: 15.81 DPS difference
with b4b: 7.35 DPS difference