I have only split one elm log. It was about an eight incher.
Now I pick trees about that same size and saw the staves with the tree standing. It's much easier in every way than chainsaw ripping the log on the ground. I start at the top and keep the saw at something like a 35-degree angle to the cut (bar tip highest) and make repeated cuts an inch or so deep. I don't use any mind altering substances and would strongly recommend against it. Also, make sure your footing is clear before starting.
Don't cut the staves free at their ends. Wait until all the slices are cut, then drop the tree and cut the staves free.
Jim