For example here are two two fish from the Abyssal category listed with the divine rod and Abyssal Glow bait as the best catch chance
The Spine Fish.
I spent like 30 min changing rods, hooks, and the curse hook. I ended up finding that I needed the bone rod to get a 1.1% and what hook I use didn't matter.
The Abyssal Blue Jelly
I spent another 30 min doing the same process as above with a much different result. I could never get above 0.87%, and I noticed that some fish would go from 0.80% to 0.17%, while other fish's catch chance would barely change.
Equipping the bone rod with ancient hook
The Spine fish is at 1.1%
The Abyssal Blue Jelly is null with a dotted border.
Equipping the void rod with the curse hook at 45%, both the spine and blue jelly are at 0.87%.
Was thinking of trying to catch all the shiny, but think I'll go back to focus on the dungeons lol