No surprise with the Unkempt Harold winning pretty easily. Looks like you managed to get the damage accessory on all of them for a nice, even comparison.
I just want to mention about shock elemental pistols, like the Thunderball Fists. Very, very few enemies in the game will resist shock, probably about as many resist slag. Also, shields slightly resist explosive damage, hardly enough to matter, but they do.
The corrosive pistols were also disadvantaged in the test, since the dummy is flesh and they get a large damage penalty. The Hornet shreds loaders like nothing else. I'd wager an Unkempt Harold would be troubled keeping up with a Hornet against loaders.