Yup, add like a normal concentrate. No chicken bone dance! No dilution necessary.
As @Josephine_van_Rijn says, steep it till it tastes good to you! But, a realistic steep time, depending on your steep method, a couple of weeks.
Don't kill the messenger, but, this is where doing single flavor test batches comes in handy. Only you and your tastebuds will know what percentage you'll need to add of a certain concentrate to "boost" the primary tobacco in the mix. It's a pain in the ass and labor intensive to do single flavor test batches, but it can be so useful when you are trying to tweek that recipe which you want to work so badly!