Any help with AFR readings with cams?

DHGbullitt1

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Tennessee
Just installed and calibrated my innovate wideband. On a cold start it reads 14.0-15.0 but when warmed up, it's jumps to ~20.0. I do have cams installed and currently on stock tune. The cams are comp 270's and I believe they have a farely large overlap of 46 degrees, please correct me if I'm wrong. Is this normal to expect my wideband to be inaccurate at idle? If so, I assume I'll have a much more accurate reading when at WOT and normal driving. Any help is appreciated, thanks.
 

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