I will usually start with 4oz plastic, then add by volume around 2oz of additive, and some softener. Stir, bake until ready. Pour, or inject. Give the float test. Repeat until satisfied with results. Just keep adding floatant in small amounts until satidfied.
That about as close to a recipe that I use for floaters. I do both hand pours, and injected stuff. One thing to keep in mind, if you're fishing the floating lure weightless, they don't cast very far.
I'm typically using a 2/0 EWG thin wire hook. You'll have to adjust for your hooks