transmission shudders

[jsmith]

going through my fluid replacements on my new-to-me 300e, i did a tranny fluid change w/ filter, gasket etc. i used semi-synth valvoline dex III. there was hardly a change in smoothness and in fact it has been shuddering slightly at moderate acceleration shifting from 3-4. at low and higher acceleration it does not happen. yesterday i tried to get the car moving quickly after putting it in drive and it shuddered a bit. do i have to back off the modulator adjustment to "soften" the shift? will a tube of lubegard help or does that have longer term negative effects? my plan was to run this semi-synth fluid for 10-15k then drain and refill it with MB tranny fluid but now i'm concerned with that annoying little shudder...