400-miles is a bit much. I prefer to lube chain every 200-250 miles on road, every 100-miles on track.
Did you measure actual chain-wear? You may be replacing perfectly fine chain with 1% wear with new perfectly fine chain.
As others mentioned, you may have some tight spots here and there due to stiff links. You can see these as pairs that are slightly angled instead of straight.
Are you applying it to inside surface of chain on lower run?
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