Make sure that the road speed you log with SAE.VSS matches the speed displayed on your vehicle dash.
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My throttle body is just the 454 throttle body and blade, I'm using the 350 shaft in it so the linkage hooks up like stock.
Here's my current file. The file I posted earlier is stock except for the EGR, injectors, fan settings, and corrected speedo/shift points. This one drives better, but I still need to dial it back some more, but it's at least driveable.
Attachment 23000
Try this tune file. If it feels like it's still giving you too much air, then take a bit more out of the cracker. Also be aware that this is a spark ignition engine... the amount of spark advance in off-throttle situations will also affect how much deceleration you get.