I talked to Tetenal about this issue last fall and was told that different times for Kodak and Fuji Films aren't recommended and that the whole issue was based on some info from several years ago adressing user-complaints which turned out to be mainly based on the reduced speed of Velvia 50 in E6 instead Fuji-chemistry. in their words the whole issue can and should be settled with Velvia 50 exposed at 40 ASA and any other Fuji-films.
Originally Posted by Galaxens President
If in doubt, drop them a line from their webpage. I got called by technical support about an hour after leaving my question. As you are in Sweden I expect them to answer your mail in due course instead of calling you.