Tuning Queries

Currently still tuning '95 3Z28 83 Lt1 M6 11.6:1 223 230 .600 .610 cam - CL SD tune.
The last few datalogs looked like the RH O2 is failing. Its starting off looking OK then seems to drop to 0 - 100mv until i rev the car or it's warmed up at around 6 mins.
They weren't like that before so it might be my tune.
I think I'll replace both O2's just to rule them out.
The Wideband also shows lean.

I've been repeatedly told to go Open Loop as I won't be able to tune it so..
I've gone back to an earlier OL SDtune with my current VE tables which were faily good around 124-126 ish BLM's
If i run OLSD then presumably I'll have to adjust the VE tables to match the Wideband's O2 output ?

Any thoughts
Mitch