I don't like the unreliability of store tp either. It's much easier to always be able to count on conserve tp and multi attack procs (never fail!).
I was actually thinking that if store tp works like haste (taking time to proc) I should steer for increasing the amount of time between my ws's. I mean if you think about it: all that ws'ing probably tires you out so you ws weaker.... plus your wyvern gets out of breath! Better to re-charge.
Nah brah you're doing it wrong hard. See what you do is simple:
First get as much minus stat gear as you can preferably minus atk and then tp in this. Next you get as much STR as you can and put it in your ws macro for MAX damage. Why you ask? Well it's simple really... If you hit for a lower amount in your tp phase then the mob doesn't think much of you and underestimates you. Then bam you bust out that stardiver with full str backing it for mega omgwtfpwndmg. He'll never see it coming.
Edit: Also only ws at 300 tp!