It's funny how we go through that. I have tried several different versions of the same idea in an attempt to make set-up quick and easy. I tried to put 3 flashes one stand and one on the camera and found the same thing you did. The flash on the camera never seems to be close enough. I also lose the top light--(Which I really like). But I have a new Idea I plan to try this week.
I purchased the Westcott Apollo soft box recently for a couple of reasons. 1. baby pictures. and 2. I am going to put two lights in the softbox and use them without the diffuser cloth, and one top light---I am hoping that the silver lining of the soft box will give me those specular highlights I have been looking for in the birds wings and feathers. Time will tell. Bob