Catch the Break
Once you've gotten that big bad thing split down by half, you may be able to lift it onto the splitter.
Once you're able to lift it onto the splitter, you can cut that half into quarters, but the pieces may still be too large to catch as they're cut.
Log cradles can help catch the halves as they're split, so that way you're not continuously bending and lifting the pieces.
This is a good thing, because a quarter of a giant log still needs to be split further.
Working in Double-Time If you've got a lot of medium-sized logs that need to be split into quarters, you may not want to spend as much time on each one.
To power through many logs in half the time, you can use a 4-way wedge to cut your work load in half. Essentially, it combines the previous two steps into one by incorporating wings on the splitting wedge to cut it into 4 pieces at once.
While this won't necessarily be the way to go with super-sized logs, it'll cut your workload in half with the average sized logs.