Lagging when shifting?? (727 auto, w/ full manual valve body)

Recently my Duster has been having shifting problems :/ when I manual shift from 1st to 2nd it's not to bad, but from 2nd to Drive is where you can really see/feel it(almost like it goes into neutral before sliding into Drive). But if I just leave the car in Drive it's fine. Shifts through 1st, 2nd, and Drive smooth, a fairly quick too.

I'm not 100% sure what could be happening, after my incident with the trans shop I am a little concerned. But after changing my trans fluid I found little to no metal shavings and no burnt odor or anything out of the ordinary.

Also, the transmission is basically brand new(rebuilt anyway) it's only got about 1500 miles on it, and only been dragged twice. So do you guys have and sugesstions on what my problem could be?