I agree that the bent frame is really hard to get your head around in terms of flowing lines. It looks as if the rear top tubes drop down slightly compared to the front top tubes under the tank. If that is the case, you could replace those tubes to make them straight all the way to the shock. That would leave the upwards part under the seat hump and a whole lot less visible.
Another trick I saw on one very orange GoldWing was they raised the seat rails to to a normal height and hid the transition where they dropped down to the main frame loop.
The usual solution is to fit a seat with deep enough sides to cover the frame rails and hide the steps.