Leftyhi-trak,
I am also puzzled, if all is as you say it is. The stock surface of the ZC should even be more aggressive than the finish you put on your OI, which should be the more flippy. Normally that zone asymmetric core seems to add length and much more backend to the same cover plus it's still a low RG core.
If there's enough side weight, you could add a weight hole past your PAP on the ZC to add some flare, but I'd adjust the cover first before putting any extra holes in it.
Why not try the same cover prep as your OI, AFTER trying the ZC for a few more practice games PLUS on another oil pattern, just to double check.
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"...for advice is a dangerous gift, even from the wise to the wise...."
J. R. R. Tolkien