'04 DC 4WD Tundra - O2 Sensors / Cat Issues - What should I do?

What's up y'all, just looking for some advice. What would you do?

Context:
I've replaced the timing belt and water pump, new valve cover gaskets, and various other parts for the timing/PS/hoses/radiator/engine bay. There was so much engine oil caked on everything, the valve covers were long neglected when I purchased the truck.
When it comes to exhaust, I replaced my resonator and muffler due to the rust.
156k miles.
She sounds great, runs awesome, and at this point it's mostly minor suspension work to focus on next. A month ago, CE light comes on and it's a P0430. Only when the light comes on does she start to run poorly/sluggish. Sometimes upon start up the gas pedal has low responsiveness and the engine is sucking huge air.

Process:
I check with soapy water on the passenger side downstream O2, the aftermarket gasket is melted away, pinhole pissing exhaust fumes only on cold startup for ~30 seconds before the heat closes the leak. That O2 sensor seal gets replaced with a

$10 Dorman 47021 Gasket For Oxygen Sensor Compatible with Select Toyota Models

Dorman 47021 + Permatex Ultra Red underneath (I'm trying to be a bit more frugal to see if the cat is just plain bad). I clear the code, and drive 20 miles.

CE light comes on again and now I'm reading a P0153 (O2 Circuit Slow Response B2S1) and P2197 (OO2 Sensor Signal Stuck Lean B2S1), so now it's complaining about upstream?
In perhaps an over-zealous late night move I order both sensors, because the mileage kind of checked out.
While waiting on the order and a little more YouTubing I removed the B2S1 O2 Sensor to bench test it and it was rather dirty, both on the sensor and in the electrical socket. I cleaned that with the appropriate spray cleaner.
While gently torching the sensor, I was getting readings that seemed fine from everything I saw online. Readings were quick, appropriate, and responsive when I applied/removed the flame. It also took an appropriate amount of time to get up to temp enough to read properly. If anything, I just burned up some of the contaminants and made sure to apply a "cherry-red" heat to every part of the sensor evenly.
Threw some anti-seize on the sensor threads and re-installed it.
Then I look to make sure that I'm not running lean for a reason, and found that I had kinked the main hose that connects to the throttle body and that the OEM clamp was loose. The kink and the clamp were adjusted, and I just kept driving around the neighborhood in the evenings.

Now, after 3 or 4 drives, all codes are gone entirely with ~70 miles driven.
I still have the new sensors and I am going to try for an inspection next week.

So some questions:
Could everything actually be good now, after the seal, throttle, and heat?
When is an inspection appropriate?
Do I not bother risking the light coming back on and replace the sensors while I have them?
What would you have done differently?

Thanks,
Dennis

 

When the truck reaches readiness, which may take a few drive cycles. Many readers will tell you the readiness state.

Your call. You may want to wait to see if you pop another code. P0420 / P0430 are semi-commonly thrown when the upstream or downstream sensor are dying.

 

Regarding inspection: I presume you mean a state inspection or emissions inspection. If it's not throwing any codes I'd get the inspection ASAP and get that behind you.

Regarding O2 sensors: you linked to the Dorman gasket on scAmazon. Is that where you bought the O2 sensors? If so, return them and get Denso sensors from a reputable online retailer like Rock Auto or Summit Racing. (not Walmart)
As to whether you should install them. If the sensors that are on the truck now are original, they're 20 years old with 156K miles on them. They may still be within spec, but they're probably nearing the end of their lives, so new ones will perform better. If you've got them, you might as well install them, then you're good for another 20 years/200K miles. Realistically, that's beyond the life of the truck.