Falkirk has huge parses on ffxiah you can check outof various moves against lvl 0 targets where you are definitely capping pdif and fstr etc. And the highest dmgs even at 3k tp for single charge moves was 19k for single hit or 21k for some of the multi hit if all the hits land well.

So those 30k dmgs are clearly coming from multiple charge moves (so not every 10 seconds) or mobs with dmg weaknesses in which case anyone can do a bunch.

And even then the couple of 2-3 charge moves that go up to 30k still require massive +att buff/-def debuffing to happen. For example on just normal cp mobs in sky which are like ep/dc using tiger for it's massive innate attack boost and /cor beast roll and full jps at effective 2100 tp my Razor Fangs do around 6-9k when capped pdif Razor Fangs at that tp should average ~17k. So you can imagine how much harder it is to cap pdif against actually hard targets

Speaking of pup dmg though there was a jp dev statement that explains the stats of the ws and how flameholder works which looks somewhat promising