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Hi and sorry for your issues. First thing I’d do is put a wideband gauge in each bank (go to a performance shop and they will weld a bung in each bank preferably before the primary cat). Get a portable wide band with two readouts (or two separate wide band gauges; I like AEM) and see what your A/Fs are when you do wide open pulls on the Highway in 3rd/4th gears. Factory tune I’d figure should be low 11.X maybe? If it’s much lower than that then I’d start wondering if stuck injector or some other issue. Is it making good factory power?
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