Err a bit on the thin side with your soap measurements. Perhaps a teaspoon per pint. I think mine was a bit too much and I it washed away a protective leaf wax a lot of plants have. I slaughtered the spider mites satisfying my cruel hatred of them; however some of my leaves look a little drier than before and the leaves that have had multiple applications since spring look a little burned.
Also use a mist spray nozzle to wash the spray off an hour or two after application!