Tansients on Downshifting

Hi everybody, I noticed that my cars OE tune stays fairly close to 1.0 Lambda during light and heavy acceleration (as to be expected), however there's an unusually rich spike in AFR after downshifts just before the fuel cut kicks on. For example, lets say during a mild acceleration from third to fourth gear the AFR is between .98 and 1.0 Lambda when traveling from 1,500 RPM to 2,200 RPM. Downshifting however from fourth to third through the exact same RPM range the AFR will get as rich as .85 or even .82 before the fuel cut. Is this normal? It seems excessively rich considering the car was able to maintain near stochiometric fueling under the same RPM and nearly identical ignition timing on the way up. My throttle position sensor confirms I haven't completely taken my foot off the gas during said event, so while its logical to see SOME extra gas, there should hypothetically be a little more air coming in the intake than what I'm seeing.

For some background, I drive a 2013 Camaro LS with a GM E39A Controller. Does anyone know if this is typical for these cars? I'm debating whether I should adjust the actual VE tables to try and tighten up the transients or just tell the Fuel cut to kick on sooner. Is there any reason I should leave all this alone? To be clear, the fuel cut doesn't kick on until my foot is fully off the gas (as intended). It's when I'm around partial throttle maybe say 15-20% or so after downshifting the AFR on a factory tune seems unusually rich. There have also been no modifications made to the MAF or intake tract yet. Long term and short term fuel trims are all within 2-3%.