In my experience letting pine sit in rounds for a bit does help with splitting. if you cut it green a good sitting will allow the sap to dry up considerably. I cut dead lodge pole pines in the national forest. when I cut them down (already dead mind you) they laugh at a splitting axe or maul. Take them down the mountain and let them set til the next weekend and they split with the same axe or maul, just fine.These are in my front yard. They had branches from the ground up. The bottom ones were 3 to 4 inches in diameter and the shorter tree was about 50 feet tall and 24 inches in diameter. The other one is much bigger. They are knotty and slowly died but I can imagine they are pretty old. The smaller stuff near the top is pretty straight and the knots are small and it splits fine. I hate to waste wood but splitting in 85 degrees and lots of humidity to get a small pile after an hour in a half sucks.
If I cut it into rounds and let it dry before I split it does that help? I'm thinking not but idk.