copying slides to color negs

what kind of film i have to use to copy slides to color negative film, also techniques, I'm using a Nikon f90x and PB6 NikonBellows, film AGFA color print film ASA 100,when i print the negs, my photos have a lot of contrast, may I have to put the ASA guide number into a lower one (like ASA 50) using the same film, to have less contrast in the negs, is there anyware a special kind of film with less contrast for this kind of use? Please send me an aswer soon P.D. If you have an aswer in spanish, it would be better, Thanks.

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