I have some oak from a while back and I am having quite the trouble splitting it! I have a mid-size splitting maul for the big stuff, a hatchet for the small stuff, and also a wedge + mid-size one-handed sledge for an alternative. Some of this wood just does NOT want to split! Other pieces split fine - even same species. Does anyone have any ideas? Trying to avoid big expenditures like on a log splitter. Perhaps I need to purchase a full-size felling axe to carve up the tough stuff, or should I go up in splitting maul size/weight? Perhaps it's just my technique.