Data points (with primordial seas): 8, 8, 6, 9, 6, 7, 6, 7, 8
If the 4-7 range is right, I'm going to go ahead and call the bonus here +2.
So I'm thinking my hypothesis that the bonus = the amount of hunger the sushi requires is looking pretty good. Based on Wyrd's test with the giant puffball, the bonus likely caps at 3. But maybe sunless caverns uses a different mechanic. Staring maki is 5 hunger, so next time I feel like crafting I can experiment with that and see what happens.
Uh, I'd rather you didn't edit the energy gains based on data gathered while under ocean sight. The formula is by no means certain, and it was only recently that the minimum energy gain on this item was even lowered to 4. I'm reverting the edit - change it if you get 3 energy legitimately without ocean sight.
In the beginning, men were mortal.
W/ ocean sight and ocean song active: 9, 7, 7, 8, 5, 6, 9
That's a bit of a large range. Initially thought the 5 was because I had done more crafting and dropped below 10 energy of Ocean Song (and 50 of Ocean Sight), but then the 9 cropped up.
In the beginning, men were mortal.
With no effects: 5, 6, 7, 6, 7, 7, 6, 6, 7, 4, 5, 4, 7, 4, 7, 6, 4, 5, 7, 6, 6, 7, 7, 4, 7
I'll keep updating this over the next few days.
Oh, yeah, I do have Sushi Chef. Good point, Raz.