@namastewatford the challenge with discounts, stacked discounts etc is it can sometimes get a little complex and frustrating as something that seems normal and straightforward to a business, can sometimes be a unique and specific set of discounting methods/rules to that business so getting something without specific programming is not always feasible. We have encountered this with our business and generally find a compromise work around which although is not always ideal, doesn't do exactly what we want and can impede the workflow a little, has to be used to get something remotely similar to what we ideally would like to happen.
Not sure I can find a specific way to achieve what you are looking for. Have you taken a look at applying discounts to a specific group, where customers with a taste card are added to the taste card group and then apply that discount to the group? This is the only thing I can think of to segregate your taste card holders from your normal BOGOF offer.
