Since I have numerous St croix rods in every model, I will tell you the 6ft10 ml extra fast model is the one you want, the medium model is more of a mag medium, the ml extra fast has a ton of back bone with a lively tip.
On the ML 6ft10 xfast rods I have, I throw everything from ned rigs using 1/16 heads, to 1/4 shakyheads with trick worms and 4 to 5 inch Yamamoto grubs on 1/16-1/4 ball or darter heads.
It's also a excellent t rig rod, I use a 1/8 tungsten bullet weight, 1/0 roboworm rebarb hook and a 6 inch fat roboworm in purple brown hologram, it's awesome for that bait combo.
You'll be disappointed in the medium for the applications you are describing.