Ok so no checking needed, its fine you've given good examples, which is probably all people ask for.
Are there any differences in calculation vs players?
Assuming a fight between the highest level players currently with the health pools they have, almost no one would survive a hit from this. How does that seem balanced?
Alibab as example has about 1670hp and 117mr, he's 4 levels higher. How would a best case calculation look against him?
Without red poison on, and with phantom resist x1, he'd survive the best possible hit from the tao (non crit), provided it's the same calculation as what Jamie just posted. Without phantom, or with red, he'd always die. phantom x1 reduces damage by ~10% it looks like, so it's worth pumping that instead of MR which is only worth 1 damage each (lol!). Getting x3 phantom resist would mean he could survive a hit even with red poison on.
Personally I'd suggest damaging the pet if explosion is based on current pet hp rather than max??? If that's true, every damage you do to the pet before it's blown up reduces it by around 0.5 damage. I've seen sins do over 1k in a hit, which would reduce the damage by 500, and I'm guessing survivable by most high levels? But I doubt any of the taos with it would like to discuss how to counter the pet, haha, so it's just a theory.