I've made a similiar recipe for sometime and get rave reviews and requests to bring it to all our celebrations or covered dish dinners. I do basically the same preparation, but make my own blueberry topping from berries we raise and freeze for year round use. I've suggested to friends they try using canned blueberry or cherry pie filling with the Cool Whip (I use the lite or fat free to make a lighter dessert) and layer the same way. I usually only slice into one layer and remove some of the cake to form an indentation around to drop almost half the blueberry topping into, then add Cool Whip and top layer of cake(extra little bit of cake scooped out goes into the center). After icing the entire cake with Cool Whip, I put the remaining blueberry topping around the top of my cake and allow some to drizzle over the sides...makes a great look! So far, after chilling in the fridge for 1 hour or more, I've been able to travel with my dessert and not have it shifting around on the plate