hello, i am using in my home developing a 2% ferri bleach for c-41 processing, am i doing right?, should i add bromide?, i know that if i donīt use the ferric ammonium EDTA bleach the base becomes different, but i donīt mind, í havenīt tried the persulfate-quinone bleach nor the copper sulfate because the ferri one is much more simpler and cheap, plus, i am doing a 6 min bleach temperature between 28-38šCelcius, is it too much?