Not sure how you arrived at your point values but it's not quite right.
There are only groups, one is shallow water fish, they count 1x
Deep sea and lobsters and crabs are counted 2x
dungeon fish are counted 3x
so, with an order of 6 fish at 20 appiece... that is going to be between 120 and 360 depending on the combination.
I suppose you might be calculating based on the quantities of bait since the quantity is connected.
The main reason I wanted to reveal that information is because I wanted you to know that the more difficult to catch fish were going to be worth more. I have not revealed anywhere the brackets for the various rewards.
Anyway, just wanted to clear that up. Thank you all for being so passionate about fishing!