you can DEFINITELY not DI the dthrow/fthrow mixup on reaction. Both of the throws are weight dependent, so because of puffs light weight its much faster than you think.
And yes, both of them need perfect down-away DI to be safe from pivot tipper (and then you still got regrab at some % and techchases)
Fthrow ->Tipper starts killing around 40% (FD, assuming middle stage). Considering how puff will always be holding down, it might kill even sooner. The matchup is ****ing 7-3 on YS lol, its ridiculous (fair/side b to grab).
This is not even mentioning that you can weakfair/uair to pivot tipper too >_>
random note: if you notice people planking (ie regrabing the ledge from below) try the better version of m2k's runoff->dair. Just jump->dair *slipoff* ->fastfall->grab the ledge. The down air hits waaay below the edge. If they delay their jump, you'll steal the ledge from them.
Another good mixup is to do it facing forward, so that you just edgecancel your dair (0 lag, not even autocancel lag) without slipoffing and then do whatever once the lag is over (dtilt, jab, counter, dash away, etc). Works a bit better against some characters and if you think they will jump backwards to regrab/side b (foxfalco for example) you can replace the downair with a forwardair (also hits below the edge if you time it properly).
This can of course be used as a edgeguard too (fair one is good vs side b cancels, downair->slipoff is **** against sheik/falcon/peach)