Sorry, my mistake--the pull-back shot was the one done at f/3.5. Looking at it again, I think maybe you could mount the flash on that Bogen tripod, and bounce the flash off the ceiling, OR bounce it off the wall AND a bit off the ceiling right where you come into the room. Looking at the cloth you used as a diffuser, I think a wall + ceiling bounce might also work just about as well,and maybe better.
The fact that you *noticed* the backlighting midway through the shoot is a very positive, and looking at the duct taped flash on the ceiling, I can understand why you'd be reluctant to re-set the lighting scheme. You are working at somewhat of a disadvantage really---lights work best on stands, or failing that, tripods, or clamps where you can quickly and easily and reliably adjust the light and its height,distance,and angle.
I am going to suggest that you try something, to create a low-budget softbox. Go to Wal-Mart or some place like that, a place that sells cheap styrofoam ice chests--the $2.79 kind,made out of styrofoam. Use a steak knife to cut out a hole in the bottom of the ice chest, so that your flash fits into the hole,tightly. Use some thin vellum paper as a front panel, and hold it on with tape or push pins. You now have a 1.5 ounce softbox that can be adjusted on a swivel head flash because the softbox is so,so lightweight. Use that as a frontal main light. Buy the large styrofoam ice chest, the kind that holds about 10-12 cans of pop and one 5 lb. bag of ice. Set the flash to wide-angle inside the box, and let 'er rip! If you don't know what I mean by styrofoam ice chest, ask your parental unit...
You are definitely not being defensive. You show the demeanor of a 40 year old man.