I fear you've large debris in system. The 2 components not replaced a 2nd time are the reservoir and rack IIRC.
You installed aftermarket reservoir. Did you ever replace with OEM reservoir?
When I install racks. I pull out the rubber caps from the in & out lines threaded ports of new, to inspect threads. I then place rubber caps back in ports, to keep clean & protect threads. It possible debris during manufacture got in rack or seal was damage, but not likely. More likely during install, something got in. You can have pressure testing done on rack. Likely to find a shop with the tools/gauges while rack in vehicle, Dealership best bet. Or pull the rack and take to re-builder for testing. They can rebuild your rack and use your rack and its OEM TRE and boots. But cost of new, would only be a few hundred more.
In one picture of fluid that was changed and then drain into catch can, where it turned black. It looks like thick sludge in bottom of catch can. This indicates a contaminate in fluid. It also has particles in sludge. If those are particles and not just bubbles, they may be metal. If metal, only two places it could come from. Pump or rack. 3 or 4 defective Toyota vane pumps in a rows, is nearly impossibly. But if pump over-torqued on engine block, they could getting be damaged.
BTW: In every pictures posted of reservoir, it was over filled.