DTC code PO730

I had a similar code, had tyranny fluid and filters changed but it called for a transmission fluid speed control part to be replaced, bought the part, but tech said it didn't need it. It is better, but still hesitates when I first put it in drive and when I first excellerate when going forward from stopped position. Also a slight hesitation when first excellerating to pass a car. Still wondering if that part might make it better