Ok so I just started fishing and cooking as well as Suffusencing said fish.

Not much is said about it in the directory and I have not found a guide regarding cooking.

My question to the iron chefs of LS is about cooking what the benefits are to each additional increase to proficiency rank of cooking?

Ability to cook different tiers of fish

Cook higher tier fish easier

also you can stack more fish

Cook faster

At Cooking Lvl 1-4 you'll get cooking xp from cooking sardines.
Cooking 5-9, you won't get cooking xp from cooking sardines anymore. Now it'll be herrings.
and so on...

The higher your Cooking Lvl is, the easier it'll be to cook sardines. Less fails, less likely to get burnt or less than 100% cooked fish.

Also, higher Cooking levels will increase your fish stacking limit. Higher Suffusencing levels adds to your fish stack limit, too.

Non-suffusenced fish has lower stacking limit than suffusenced fish. For example, I currently can stack up to 545 plain sardines (cooked or not), but if they all are suffusenced, I can stack up to 700 or more. I dunno what the limit is, but it definitely is a lot more.

thanks for the cooking info

indeed, very informative thank you all