A balanced solution would be for QP to use full monk levels (+10 dc) and have GMoF grant +1 to monk ability DC's for every core (+5 DC). That would put your QP DC at a 68 which makes the max wisdom monk viable in all content.
Quivering Palm needed a nerf, however; the current U21 solution would make the ability useless (again). My suggestion would make it difficult to get effective DC's, but not impossible, a 68 DC is workable.. you might need to stack some improved sunders to get it to land on higher fort mobs, but it will land, add in the +4 from having it fail once and you are golden. On low fort save mobs QP will be just as effective as before.
This counter-proposal will allow the wisdom based monk build will still be a viable build. Additionally the +5 to monk DC's in GMoF will make many of the other monk abilities in that ED useful in end game content.