As previous posts it just takes time to adjust, just wait till you get hold of a turbo fan and you need to adjust all over again!
Been a while since I flew the PA34 but setting 33" initially would give 36" once the lag was over(we used reduced take off thrust) and like wise during stall recovery, go for 25" then fine tune!
figures may not be correct but you get the idea??:
kempus