In this site i found that someone developer with D-76 (1:1) for 10 minutes, but I usually dev in stock It's more contrasty
My last resourse is try to guess the dev time by cutting some strips of the film and develop (with light on) in intervals of 1 minute and guess the best time (this method is the same as i used to guess the dev time in very expired old film, check the link below )
¡If you have any idea please let me know!