i have not seen 9/32 200 grain points anywhere.
i use the 200 grain points from 3 rivers, they are tapered behind where they screw into the shaft and the fit the MFX and other 9/32 shafts with no problems.
I use either the Easton HIT 50/75 break off inserts or the 3 rivers 100 grain inserts depending on what I am trying to acheive FOC wise
For tuning i bare shaft with just a tiny bit of hot melt to hold the insert in place, or with electrical tape holding the point/insert onto the shaft, then when I have got the tune i want its time to epoxy them in place.
As far as your spine choice I think you are in the ball park... on my bows arond that weight I use 400 spine cut to 30" with 75 or 100 inserts, I draw to 29" and I have adequate broadhead clearance for my fingers... Your tune will depend on your bow (cut past centre amount etc) and your form.. but I reckon 400 spine will get you in the ball park for sure, start long and cut down a little at a time...
hope this helps.