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

Okay, that confused me a bit. You're saying if he DR's at 45:15, I should wait until he stops DRing, then attack until 44:32?
Why only attack PB when he's in attack animation? I've heard this before but I'm wondering why this is needed (if the 17 second timer thing works like I think it does)?

PB's DR has a 43 second cooldown since the moment he casts it, i recommend just counting 40 seconds and stopping attacking, makes it easier to time too (i.e: he reflects at 48:33, you stop at 47:53) that would also be the perfect time to crash him, keep note of when he uses reflect while crashed so that you can keep the timer going.

the attack thing is as carrion said, if you know PB has reflect ready to cast, you wait until he's doing another attack (say, the tail ground pound) since he's using X attack, he isn't reflecting, so you hit him while he's doing it, and stop inmediately.

you're right about the 17 second thing btw. i just recommend the minus 40 (or plus 20, both work, and it's easier math)

summons/familiars can attack during DR, and are a good way of knowing if DR is still active or just blinking, blinking DR has killed a few mateys. and for damage reflect timings, maplearchive has them