Most competent opponents in PVP know how to dodge spells, especially lighting spears. Make sure to use Sage Ring as it'll make you much less predictable. If you're comfortable with taking extra damage, Lightning Clutch Ring is also super beneficial.
Also, unlike Str and Dex, Faith's soft-cap is at 60 rather than 40.
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Sage ring isn't too good with LS because it already has a fast cast time.
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I think he meant overall, not just for LS. Spells as a whole are super telegraphed and that's why they do so poorly, so even with LS every bit will still help.