Having a passion for cooking myself, you rarely hear of "tangy mustard" without a "sauce" or "dressing" combo keywords attached to it. IMO, "tangy mustard sauce" or "tangy mustard dressing" would've been my pick. A reg fee, if undeveloped.
"ChickenGrilled" and "BarbequedChicken" don't sound proper to me and unlikely will have any type-in traffic. A reg fee, if undeveloped, IMO.
"Dry rub seasoning" has better chances to find buyer. There is a market for it. "Spice industry" has been booming lately. A low xxx, an end-user price.
Good Luck.