Yeah, that's odd that it fragmented in that test. Maybe the jello wasn't the correct mixture or something, or maybe the speed they were pushing it to was too fast for the all-lead bullet. Or could have been a defect in the individual bullet. That would seem like a good load for personal defense, I'm going to stick with the 135gr+P Speer which is far most cost effective so I can practice more with it. Next choice would be a flavor of that 158 LSWCHP though.
As S.S. says, with gel made the same time everytime, is the best way to get consistent results across the board.