I have the exact same experience here. Same year and auto, same tuner too. It does seem almost..dare i say it slow...after like second or third gear, you can hear your cars exhasut lighten up too, i think that it is a combination of the eco tune maybe, i have the performance tune also they both seem to run through the first two or three gars pretty quick leaving your last one sluggish feeling.
1989 5.0 LX Coupe Flat Black Manual. (Current project #2)
1988 2.3 Turbo LX Hatchback Black Manual (Current Project)
2004 Mach 1 Torch Red Manual (SOLD)
2006 GT Convertible Black Auto (Totaled & SOLD)
1994 Cobra Black Auto (SOLD)