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something that can happen is that the work platform on a drill press is not square to the bit in the chuck....put your bit in the chuck....take a small square.....place the square on the platform and slide it up against the bit....the square should touch the entire lenght of the bit..if there's a space anywhere along the bit the platform is off....this will throw off your center drilling.
plus it sounds like your not getting the bottom of the plug dead center to the center of the bit that's above...in other words the bottom of the plug is set off to the side where it sits on the platform.....
split points work fine once eveything is lined up. clear the flute's often and it'll drill true.
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