I've skipped the formula A and B on future batches. I simply add a little bit of everything I can find at the supermarket. I've learned to stay away from the very fatty fish though. I added a little salmon one time and steel head trout another time and I found the oils dirty up the tank pretty quickly. stick with the white meat fish.
Some grind up Nori in their recipes and some folks add a touch of garlic as well.
I also like to add a bar of Cyclo-peeze to my batches.
everything else is just what happens to be available and affordable on the day I'm at the market.
Yes, it's trial and error with the consistency, as too fine a mixture will not be ideal, and a batch with large chunks won't work either. I tend to use a feeding syringe and I hate it when it gets clogged up with a piece of squid or something.
Plus, you don't want to be feeding your LPS
giant chunks of food either.