I actually got a PDF copy of the FBI's Jello tests back when I was in college. I was in a statistics class at the time and was learning a spiffy new TI-89 calculator so I pounded the numbers for another forum. At the time I was on the other side of the argument, trying to defend a recently acquired USP Tactical 45. I was rather surprised when I discovered the .45, based on actual test results not theoretical (and in this case, wrong) high school math exercises, only showed about 15 to 20% more wound volume than competing lower caliber rounds. What your math exercises fail to account for is the fact that none of us are using non-expanding FMJs for personal defense (I hope). Our current crop of defensive JHP is pretty good at expanding across the board. This expansion is largely determined by velocity, however, so a round with a velocity of 1100 fps will always expand faster, more violently than a similar round with 850 fps. Because the 9mm has a velocity advantage of, watch this, 29% over the .45, it has benefited more from the advances in hollow point technology.
And again, even beyond the math and physics exercises, it is a fact that in real world situations, neither victim nor coroner can tell much of a difference between a 9mm JHP and a .45 JHP. Neither is a 100% shot stopper. You should probably train to prosecute your threats until they are no longer threats to you either way, and whether you're shooting a Glock or a 1911, a 9mm gives you more opportunities to save your life than a .45.
The 1911 is a living legend, a masterpiece, and properly built and assembled as much a work of art as a machine. Our country owes JMB and the 1911 a lot. A few years ago I had a chance to maybe pick up a 1911 for several hundred bucks off the sticker price. I was tempted and did some research. What I found appalled me. Even on forums dedicated to the 1911, there were a surprising number of people who admitted to loving the 1911 and having enough invested in their collection to pay off their mortgage, but who readily admitted that they left their 1911s in the safe when they strapped on their CCW or duty piece. Their will be collectors of the 1911, aficionados, and those who enjoy them for their history and nostalgia for generations to come. But all but the most ardent and stubborn out there fully realize that the 1911's time as a premier defensive and combative handgun is waning.
And for those who want real performance that starts with a .4 from a handgun, there is the 10mm Auto...