Don't use extract. It's not right - it's too diluted and may be in alcohol. You won't hurt anything by adding a little but it's unlikely to do much.
Go to OneStopDIYShop.com and get some Flavor Apprentice flavor. They have Loranns too but supposedly those are a little trickier to get good results with. They have Black Cherry in Flavor Apprentice or Cherry Blossom which is a delicate flavor.