Are there any other skills that don't damage during DR?

When PB starts the DR animation, take note of the time and add 17 to the clock. That's the point that you should stop spamming attacks.

Ex: DR's at 15, stop attacking at 32. Only attack when PB is in an attack animation.

I'm not sure how long DR lasts (it seems to vary), but just watch PB.

If you have a crasher, crash 1-2 seconds before the 17 time.