New O2's for 2 weeks worked, now code 33 after side swap

[300ZXing]

First of all, Thanks for all the help. The codes 33,34, and 43 from ecu were actually good intel. It's been running like camp for two weeks but started missing again on left front cylinder (driver's side) intermittently just like before.
Now I get only code 33... left O2. So, I remember you guys advice on cheap O2s and thought OK I should buy best OEM available and replace both but wait ... one on the right side works, right? So, I disconnected battery to get to right side and Swapped both of them to opposite sides. Makes sense to me to see if ECU was right. Started it up and is running rougher than before.
Checked codes and got 33 again. Can bad cylinder cause the other O2 to go immediately ?
This front left cylinder and all the others have had a Lot of attention:
1. New plugs
2. 3 Coil swaps
3. New injectors
4. New injector connectors (waterproof)
5. Compression test matched with other cylinders 150lbs
6. Fuel pressure on left side rail same on other 2 left side cylinders run ok.
,.,.,. Battery disconnected during O2 swap, reset new read from ECU. Still gotta 33 code . Any suggestions?
PS. Every cylinder was firing perfect last week for 10 glorious days after New O2 installation.