Why isn't fuel cutoff on decel working?

TheFleshRocket

Likes to drive sideways.
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I want to enable DFCO (decel fuel cutoff) in the tune on my '03. Originally, the settings were as below. No matter what, letting off the throttle results in pops and burbles and clearly a bunch of unburned fuel coming out the exhaust. With the top down, I get a fair amount of gas smell too, which can't be good on the cats either.

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I found this old thread that talked about how to disable the DFCO for someone who had it on and wanted it off. Based on suggestions on how to disable it, the following settings were changed in the hopes that they'd cause DFCO to start working.

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What needs to be corrected to get DFCO to work? My 2011 Audi S4 6MT cuts fuel in less than a second after letting off the throttle and coasting, and I'd like my Cobra to behave similarly.
 
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