You have already done so much, but if you have info on setups similar to Jarrell - AND you don't have to do too much digging.....
I am super curious about these setups where you get basically one big giant violent storm, and pretty much nothing else.
Obviously I'm waaaay late on this, but I just realized there's one textbook case that I've apparently never mentioned here. It's relevant here specifically because it was pretty Jarrell-esque in its overall evolution, but it also appears to have been violent enough to warrant inclusion in a "most violent" discussion. So, if you'll excuse my hijacking this thread with another very long, picture-filled post, here's a story for you..
It was a clear, sticky day in May. By midday, temperatures had reached the mid-80s with dewpoints hovering in the lower 70s across most of the southern half of Texas. The atmosphere above didn't exactly scream "tornado outbreak," but strange things sometimes happen in this part of the country in the presence of strong instability. With that in mind, the SPC issued a rather large moderate risk encompassing much of the central portion of the state. The cap ruptured by mid-afternoon, sending a massive supercell billowing into the skies over the Hill Country. The storm drifted slowly at first, taking on an odd and highly deviant motion. New updrafts began to pop up on its southern flank, flaring to life only to merge with the existing mass of storms. Suddenly, a massive funnel descended from the clouds and began a slow, meandering path of destruction, scouring vegetation from the earth and demolishing anything that lay in its path.
Sound familiar? No, it's not Jarrell. This event occurred on May 11, 1999, over a desolate little stretch of southeastern Mason County near the tiny outpost of Loyal Valley. Officially, the tornado went into the books as an F4. Unofficially, the sheer intensity of the damage suggests it was capable of much more. It produced very intense ground scouring over most of its ~7-mile path. One observer later remarked that you could see the full path because it looked as if the tornado had "dragged itself" across the landscape, plowing up the ground as it went. This can partially be seen in the cover shot of the May 1999 issue of Storm Data, which frankly looks like a war zone.
You can also see the extreme tree damage that it caused, which is especially notable because most of these are mesquite. Mesquite trees are known for their ruggedness, as well as their strong and deep root systems, and yet this tornado completely debarked and denuded many of them, snapped some off very near the base, and in some cases tore whole trees from the ground and tossed them hundreds of yards. For instance:
There were very few structures in the direct path of the storm, thankfully, but those that were in the path were completely destroyed. This is what was left of the home in which the tornado's only fatality occurred, and bear in mind that this home actually appears to have been slightly outside of the most intense core. A family of six sought shelter by driving their car into the garage (variously reported as being built from either stone or concrete); the home and garage were demolished and at least partially swept away, and the 74-year-old grandfather was killed when a 2x4 penetrated the car and impaled him. The others miraculously survived with relatively minor injuries.
A new truck which was parked near the home was torn apart and scattered over three-quarters of a mile. Here's the hood of the truck several hundred yards away.
In the same general area, the massive multivortex wedge (more than three-quarters of a mile wide at that point) scoured away more than 700 feet of asphalt from Ranch Rd 152, throwing chunks of it over a thousand yards. Hundreds of head of cattle were killed and badly mutilated, as were a number of horses, deer and other animals. An Air Force meteorologist who'd surveyed Jarrell two years earlier had this to say about the Loyal Valley tornado:
"Hecke said Tuesday night's tornado likely was an 'F-5' grade - the severest category, marked by winds of more than 260 miles an hour. 'The two homes that were destroyed, the foundations were gone. Trees were stripped of their bark, and 150 to 175 feet of pavement was stripped away' - which occurs only when windspeeds reach F-5 level."
And a TV reporter who'd also witnessed Jarrell said this.
"'I hadn't seen anything like that. I couldn't believe what it did to animals,' said Flores, who also witnessed the destruction at Jarrell. 'The subdivision in Jarrell that was hit by the tornado was wiped clean. This was wiped clean, too, but the cattle - their hides had been ripped right off of them. Some of them were missing heads, and some were caught up and entwined in barbed wire.'
'There was absolutely nothing left of it [the new pickup truck]. It looked like it had been blown up by a bomb or something. Two dead cows were lying at the foot of it ... their skin was gone. They were pink and purplish. No skin. It took the skin right off.'"