All I know is that I can make my BVM F-86 come to a virtual crawl with full flaps and air brakes and gear down with straight and level flight. Maybe it would do better with TO flaps. I'll try it and see.
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Full flaps may be giving you approximately the same lift as takeoff flaps only with more drag. Speed brakes and gear down add to the drag. The net result is you can fly slow but it requires a lot of thrust. Takeoff flaps clean would likely do the same thing only with a lot less power. What I would love to know is how much less. It may actually feel more comfortable to fly slow with everything hanging and the power pushed up. A slow flyby with takeoff flaps only might only take a little more than idle thrust. Since we fly these little buggers with sight and sound, it might look and feel a lot less solid with the airplane just whistling by. Then again, I've seen Dave Malchione do slow flybys with his KingCat that were spectacular. As I recall the gear was up and just a little flap hanging. It was going so slow you felt you could reach out and grab it, if you weren't looking at the flight line you'd never know it flew by. I know because he's snuck it past me many a time!