Hey, Bob!
I waited until the wine was stabilized and clear before racking it onto the fruit and oak. Six pounds of fruit in the primary (per the recipe), then the three pounds applied after clearing. I wanted the fruit flavor from the triple berry blend and it's natural sugars to be imparted to the DB without anything else interfering. It's been about two weeks, now. I'm waiting another week (since I will conveniently be out of town next week) before tasting, to see how it's coming along.
James' sweet fruit extract might be a faster way to impart extra fruit flavor to the wine, but getting the oakiness I want takes time. The wife wanted the original, unmodified version. She's got hers. This one is for me.