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I'd go with this advice. Successive generations of sharpeners and users may well have lazily turned your chopping axe into a splitter. I bought a cheap splitting wedge a few years ago (had to deal with some really gnarly firewood) that was so blunt-angled it wouldn't 'stick' into wood via a light tap and would 'bounce out' with every sledgehammer strike. Had to resort to using a portable grinder (and for quite awhile) in order to get the tip angle to be more suitable. If you have to resort to extensive re-grinding in order to get a slimmer tip profile make sure not to overheat the blade or you'll lose the temper in it.Those have thick blades. A worn one will need substantial re-profiling before sharpening. I'm guessing your edge angle is too wide.
Mine chops nicely.