Fork upgade?

I've got a 2016 Rockshox Revelation RC3 on my Specialized Camber. I think the Fork has quite a bit of flex and nosedive even under just brakeforce. The PSI is right in the fork so thats not the problem. Would i benefit much from upgrading to a RS Pike or even a Yari? Thanks

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Why the capitals in sag?
The compression damper in the Revelation is very crude and only really works fully open.
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Indeed, but couldent really decide where to post it