Is the bow cut to center? If you want to use a lot of weight up front and it is cut short of center your going to have to use a lighter spine, not a heavier one. When you work on HFOC and EFOC your going to find that the bending point of the shaft effectively shortens the shafts spine length and thus increases the spine.
I think you will find that full length Easton FMJ 500's will be a great choice for you. I have a bunch of them and would be willing to send you some that have 100 grain brass inserts in them to try out. If you like them we can talk.
If the bow is cut to center either 400 or 500 spine shafts will work for you depending on head weight.