Slow shifts in the morning are usually fluid-level related. As in too little fluid. did you have an electrical connector o-ring leak like basically every Crossfire will or has had? My chrysler dealer DID NOT replace my fluid after repairing my leak, maybe yours didn't either.

But yes, a tranny uses more fluid the colder it is. This is why you are suppose to measure the tranny fluid level when the tranny is hot and has excess fluid sitting in the pan. In the morning, especially the coldest of mornings, all of that fluid is sucked up and used in the tranny. if you have too little, cold = no or very slow shifting.