Pausing for 1.0 sec is a DPS loss greater than any rotation change.
In addition, when you eyeball the debuff timer versus your attack execution, you need to accurately compensate for the animation of the CT (e.g. the debuff is not applied exactly when you press the button), and you need to theoretically do so 3 GCDs before the event (e.g. you need to estimate whether or not your CT will clip before you use ID, based on the usage of Jump and delaying the train of GCDs).
Just change the rotation an' prez teh buttonz.
*If you're already in the situation where you've used DE then yeah, you don't have much choice other than to fill the 1s gap with a DFD or SSD or something, but from an optimization perspective, you don't want to be in that position in the first place.
Edit:
Someone make SE enable DOT clipping regardless of DOT strength.