You can have both Bash 3 and Pain Barrier 5, right ? I don’t see a problem
My pelt1>hop3>doppel1>dragoon have only 3 kd: Bash + Umbo Blow + Mordchlag (Long Stride cd is too much to mention) and Bash is the best kd:
/When you face north, all mobs will be kd to the north, the distance between kd mobs stay the same. Mordchlag/Earthwave/Doom Spike will make mobs fly all over the place
/The kd distance is not too far like max attribute Umbo blow, fast animation
There will always have some ppl gone batshit with the tiniest of things. Like when i play fifa, some trigger because i do 1 normal slide. No need to let ourself be affected by them, unless you really use it at the wrong place 

(but seem ok for fake multi like Pierce) I mostly use DPE when there is a strong nuker in party. Use swashbuckling to pull ~15mobs, active DPE and wait for Elememe blow all of them in 3s. 100% extra exp. Same goes for Siaulai mission