Sometimes, the Legends polish needs some pressure, if that's what you used. I got a good shine on my World Class, a similar coverstock. Try sanding it to 1000 grit with Abralon or 1500 grit and then try the polish again.
Also try a slight bit of water on whatever pad/sponge/cloth you use to spply the polish, before your put the polish on it.
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"None are so blind as those who will not see."