I believe that pinholes resulted from acid stop bath coming into contact with developer containing sodium carbonate. Kodalk was developed in the 1930s to combat this problem. Carbonate in developers is very rare now days.
That being said I have always used water stop bath. Fill the tank with water (same temp as developer and fix) agitate for 15 seconds (12 inversions for me) drain and repeat. Then into the fix. Always used stainless steel too.
Didn't even have to change my procedure when I finally did use a carbonate accelerated developer!