Nice project.
Oh, you’re using the Seashark from this Chinese ESC brand called Favourite (fvt for short) , 12s compatible. They have 120A cont/240A burst ESC for 80usd and a 200Acont/ 350burst ESC for 116usd.
Their boat ESC model from their commercial site : http://szfvt.com/en/product-15-6-3-3.html
Where did you get your current data from ? A separate data logger ?
[Edit:] @Mab did find a way to make his Seashark 200A work, setting the timing to “high”.