I frequently enlarge 6X9 negatives and double-checked that it was set for the right format, though it was set for 35mm I have in the past forgotten to make the adjustment.
I have tried longer focal lenghts and that only reduced the image size. It would seem that a wider angle would work but at the expense of losing some of the image.
The recessed lens seems to be the best solution and I will give it a whirl this weekend.
Again, I thank all of you for your input.