from my understanding, the 6 instinc messages are based on the fish VS the tolerance of the rod you're using. For example, Yew fishing rod can pull up moat carp with ease. So you get "good feeling" most of the times. On the other hand, if you hook a rusry subligar with Yew rod, you'll get bad feelings, or even terrible feeling. Because the subligar is way too heavy for Yew rod and has a high chance of breaking it.
3 feelings we considered "good." Altho the 3rd one doesn't sound that good... it is still good.
These messages usually mean small size fish, items, or even monsters are also indicated by these.
- You have a good feeling...
- You don't know if you have enough skill...
- You're fairly sure...
3 bad feelings. Usually will indicate a "big" size fish biting. Very heavy small fish and items can also give this message too.
Monsters normally won't give these messages except a few NMs.
- You are positive...
- You have a bad feeling ....
- You have a terrible feeling...
for more info about fishing, check out this guide.
http://www.titanictus.com/viewtopic.php?t=752