John-
I will typically snap a straight chalk line on the log and run a 1.5-2 inch deep kerf with a circular saw from one end to the other. Using this end to end slot, I then run a line of wedges down the log and give them sequential whacks until the log is split in two. You can do the same with the two halves.
Since you will be removing all the outer sapwood, you really aren't hurting anything and this helps with getting a more even split.
Good luck and like everyone else... I would love to see some photos.
OkKeith