I know it seems that way, but...
Assuming their curvatures are the same, a thinner tip hits the CB in the same place as a fatter one, producing the same amount of spin. The only time a thinner tip might produce a different result than a fatter one is at the miscue limit (~half way to the CB edge) where the very edge of the tip comes into play - then a fatter tip might be able to hit slightly farther from center before miscuing.
Think of a thinner tip as being the same as the inner part of a fatter tip - the extra outer layer on the fatter tip only hits the CB on shots with near maximum spin. Otherwise it's as if they're the same tip.
pj
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