Your pinholes are being caused by the sudden transition from the very alkaline developer to the very acitic stop bath. If you will use a water rinse immediately after the developer and before the stop bath, you should be able to eliminate the pinholes. I have made this a standard part of my developing procedure for many years now. It is possible to eliminate the stop bath altogether, but it will reduce the life of your fixer, so I don't recommend it.(posted 8921 days ago)