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Need help, Eq Err part throttle tuning GM

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I watched the Webinar 215 and got most of it. I believe you were still in closed loop correct? I have an AEM WB controller Bosh 4.9lsu o2 sensor and set up a histogram using EQ Err for MAF and VE. Disabling closed loop to use this for part throttle tuning GM Gen 3. I've been told never to tune part throttle with WB, ever. Never ever seem like harsh words. The reason I'm wanting to use the wideband is this is a flex fuel vehicle although we don't use E85 it shows to have E20 in% alcohol PID and so I want to tune in lambda for accurate results. Can the COT be disabled for the hour or so to tune the tables and not hurt it? What is the best way not to kill the Cat converter if still installed during tuning sessions?