2014 Honda pilot live stream O2 data questions

[Brybo86]

VCM Muzzled since 88k now has 109k.
No oil usage between changes.
PCV changed 20k ago.
Valve adjustment has not been done.

Last summer I got a p0420 after a few hour highway trip at 80mph
Reset and didn't come back for a few months of more urban driving.

Now the CEL is p0420/p0430 but mostly p0420

If I run a tank of fuel cleaner like chemtool or techron the light will stay off for a month but the time before it comes back on is getting shorter.

Here is a link to my 02 sensor/fuel trim live data from torque app at idle, rev in park and then driving a bit.
0-50 sec is idle
50-1:45 approx 2500rpm rev in park.
Then about 2 minutes of driving.


I'm not sure where I should begin my investigation.
I guess my question is do the sensors appear to be reporting correctly and the cat efficiency is just subpar?
I've crawled underneath and I don't think I have any exhaust leaks.

It seems like for a second or two when I let off the gas the equivalence ratio/ lambda will hit 2 briefly.
Letting off the gas is when I see the spikes.
I'm not sure if that's normal or not.

This is at idle.

2300rpm in park.

Right after letting off the gas in park from 2300

80mph cruise.

After letting off gas from 80

Are the dips/spikes when letting off the gas normal?

 

[Brybo86]

For what it's worth I tested the live stream data on my Odyssey with exact same engine also muzzled but has 170k on it and has never thrown a cat code.
The behaviors of the sensors are nearly identical. Drops and spikes after letting off the gas.
The S2 sensor that hovers close to 0.7-0.6 may have slightly more moving but I'm might just be grasping to find a difference.