sharpness
My original super splitter, 28 inch handle came super sharp and it has to stay that way to split well. I can tell *immediately* on one whack if it got dull and will stop and give it a few strokes.
I also use the straight over the head swing for best results.
They have a video at fiskars website that shows their trained pro splitter dude with that swing. I started out with a normal "maul" swing and found out that just doesn't work as well.
I do that overhead swing, or if it is fast wood, just half swings with a fast snatch back pull up to get set for the next one. More a chopping motion than a full long swing. Rapid fire splitting of multiple smaller rounds inside a tire for that latter type splitting. WHACKWHACKWHACKWHACK and WHACK. Real quick.. did about..~~ a dozen or so rounds tonight, mixed, cherry, maple and oak, largest not big mebbe 14 inches diameter, and I cut to around 16 long as a general rule..
So..I think you got a bum one, go back and see if the others are sharper, or send it directly back to fiskars and b***h about it. They should come sharp, they ain't gonna work dull. They aren't mauls, they are axes, that's the difference, two different tools. Mauls are dullish, axes only work when real sharp.
Oh..hmmm...depends on the wood, maybe work outside to in a little, and make sure your strike is dead on straight, no twist or lean to it.