Never grown Rosaberry, I will by the end of the year.
I recommend trying shortbread. I did a two packs last run and got some top shelf phenos.
If you don't top the shortbread, a good percentage end up with a huge main kola nug. A good percentage of the females I got had a tart fruitiness that I highly recommend you turn into concentrate.
I had a nice run made of bho with it and the flavor really came through.
I'll add a link to my thread, it has everything you need to know on the last page, I posted one post of a summery of the whole grow. (Just so you don't have to read the whole thread). You'll have to go back some pages to see pictures of the 10 different females nugs.
I'll also throw in a link from another member triggle, he also did a shortbread run and has some great info to know and nice pictures.