Fishing with fish hat

[Serenity]

So the fish hat is supposed to increase our fishing chance. I do see the result of this, i.e. I'm getting more fish than before. However, I'm not getting as much OCAs as I did before (without the fish hat). I'm just curious if it is the case that some how the script to increase fish with fish hat also accidentally reduce the rate to get OCAs. Probably only the GM who wrote the script will be able to answer this question, but perhaps someone here knows about it through personal experience and can enlighten me.