Constant 02 sensor codes

[RevGTO]

I've been running LT's for a couple of years now with occasional codes. Lately, they have been popping up every day or two. I tried a new Denso and swapped it from side to side, but if anything, it was worse than the stockers. My fuel trims are fairly high, my exhaust smells rich, and my mileage is crappy.

Three questions:
1. Would lowering the O2 switch points possibly help?
2. In order to run OLMAF, do I have have to do anything besides raise the CL temp enable (B4205) and disable fuel trims (B3801)? My cat protection (B0701) is already off.
3. Is editing the B3605 OL Commanded Fuel advisable?

Thanks for any guidance.