[HusbandoMax]

Is there a way to have a bit more control over what the Spearfishing tool uses?  For example, at the Kobyashi Maru location I would like to use a large head to go for Motley Beakfish.  The tool wants to use a small head only and go for Bashful Batfish to spawn swimming shadows and try for an Ichthyosaur (at least that's what it seems to be doing).

I assume you're using my profiles that are on my discord?
You can make your own profile or just simply edit the ones you're using. There is a full detailed guide on what you can do with a profile if you hit the "?" button on the addon. 
If you open the profile you want you will see 2 Gig settings for Swimming and Teeming that you can change the type of.