Hello Annie, I have been trying a couple of sloper patterns produced by Connie Crawford, to my knowledge there are three that she has produced with multiple choices for a fuller bust. CS1301 is a shoulder princess seamed top, CS1302 is an armhole princess seamed top and then there is another one which I do not have which is an ordinary button through blouse top with traditional side bust darts and waist darts. They come in multiple sizes Miss sizes 8-20 and go right up to a H/I sizing, and Womens 1X -6X and again right up to H/I sizing. So you select the size package, either Miss or Women and then within each package there are the different full bust pattern pieces. From memory there might even be a Tee shirt type top.
Try looking for these patterns particularly on IslanderSewing.com as they seem to have taken over Connie's patterns. Of course these all come over from the USA so do think about this when and if you order, I believe the Customs will pounce on anything over the £15ish mark so beware. Mine I had sent to my sister in Canada and she brought them over with her when she last visited me, as I had also bought a Grading Book which was quite expensive. At the time my order came directly from Connie and I believe that she may possibly be ill as I suddenly got a notification that Islander Sewing were going to be dealing with her patterns. Go and have a look and see - you may find something you like and that will save you a lot of time worrying about doing a FBA.
Incidentally I came across these sloper patterns in Threads Magazine of December/January 2014 called 'Add a Princess Seam' and the article involved was by Connie Crawford herself.
Hope this will be of some use to you.