a hydraulic plate will get rid of that mid range porpoise by lowering it down.
i would not install those wedges, as it will take away max available trim.
do like josh says.. get the prop looked at first, then add a hydraulic plate later
if you want. (btw, i have them on sale)
also take a good look at the mounts on the power poles.. you want them high enough
so they don't drag. you can loosen the side bolts on the slide master and raise the poles
as high as they will go. that might help some too.