That was a lot of power thinking CPW !!! 🤔🤔🤔.  I   Cannot answer any of your questions , but the foliar spraying. I don’t spray anything on buds at all. Never really did any on the plant itself either. I like the all natural, just plain good ol fashion smoke, and barnyard compost/ rainwater.   I agree with you that liquid kelp would be a disagreeable flavor,    plus the residue you  already mentioned may still be lingering.    Interesting......            😊