yes buff/debuff apply when you use PB but when the PB end,the next attack wont have any stances that why most use PB-twin-demo-snapx2-dragon kick (pb go down) and dragon kick again to start the stance again.

so yea there many way to use PB but there probably no *optimal one*.it depend of the situation.a long fight without to much risk to lose GL,using it as opener.primal fight with hight risk to lose GL,using it as burst.need hight dmg aoe like in T4,PB with spamming rock breaker.

opener:TOD-PB-twinsnake-demo-snapx2-dragon kickx2

burst:after reaching GL3,dragon (BfB) -twin (ir)-demo-fract-TOD-PB-spamming snap but this will make you lose twinsnake and DK so before PB end you could refreash both.

aoe burst:dragon kick-twin-bfb+IR-rockbreaker-howling fist-PB-spamm rock breaker.

that the way i see it.my burst rotation might need some work since i was using snapx5 before but yea....losing my twinsnake and DK so....need to test few thing,something like snapx3-twin-dk mabey