In your F1 breed a HM (or maybe even OHM) to a CT with CT parents. This will give you mostly super deltas with extended rays (delta combtails.) Pick the offspring with the largest spread and breed back to the original CT to improve ray extension. Then choose the best offspring with the best ray extension, and breed back to the original HM.
Keep on this process until you eventually have what you're looking for. You'll probably get some nice halfsuns out of it, which are selling for a pretty penny if the web reduction is just right.