Originally Posted by pdej4
How do you know the film is correctly exposed?
The advantage of using a stop bath is that development stops basically right away. With C-41 you're at 3 minutes 15 seconds. A 1 stop push is only 30 seconds longer. A little long with your timing. The time from pouring out the developer adds up. Then using water to "stop" the developer will add up. Suddenly you've pushed the film without knowing it.
Use a weak stop to minimize any potential problems with the acid and the developer. Try for around 1%.
If the negatives are really over processed then you don't want to increase the developer time. I'd try using stop before trying to cut down the processing time. If you're using enough developer to cover the film and to process the film [kit should tell you that] then using more won't help. Using less can cause problems. Remember you need the greater of the amount of liquid needed to process the film or the amount that is needed to cover the film.