O2 blues

[tc86gn]

My O2's stay the same no matter what I do. low 900's. Car runs great. But this is annoying. Even when I turn down the FP two or three psi I still get the same O2 reading. I have tried every setting from 35 to 42 psi and Get the same O2 readings everytime at WOT. I had to leave it at 42 so I get no KR at all. This is as low as I can go with 18 psi boost to get 0 KR. I did a search on the topic but could not find any solution to my problem.
18 psi boost
910 O2's at WOT
TA49
009's
Kirbans heated O2
Jay C 93 chip
hotwired BGC FP
KB adj FP regulator
70 mm TB
KB turboflow heads
Gutted cat and stainless exhaust w/dynomax muffs
2 1/2 dp
KB headers
All of the necessary upgrades.
Everything is tuned fine and engine runs great. Should I really worry about this high O2 reading since I have tried everything to cure it to no avail?
Just how accurste is the O2 readings on these things. I hear of people getting 750 O2's but I cannot come close to that. I have gone up and down boost and fuel pressure ladder several times only to get the same readings. I am totally stumped on this one.

 

[gndriver]

I feel your pain I'm haveing the same thing happen to me i even changed the o2 sensor 3 times and nothing I'm in the high 800 and running almost 40 lbs of fuel.

 

[turbosam6]

I'd lose the heated o2 sensor. Also use an egt guage to see if it is actually rich.

 

[tc86gn]

The only way I could tune it was to tune for 0 KR by raising FP 1 psi at a time till I got 0 KR at WOT. even put in a xylene mix to see if It would help. Same readings in the low 900s. I guess The only way to know for sure is to get an EGT gauge. Fortunately I just purchased a ME from the parts for sale section and it is on the way as I type. This will eliminate the O2 all together as I understand it and should make tuning a bit more fun and with good results. I was just trying to tune this thing as good as I can get it before I install the ME. I am just very skeptical about tuning to O2 readings. I wonder how accurate they are. Also what is the downside to a heated O2 sensor?