If what you propose works, you won't need the reset, will you? Think about it this way: At your weights, a 10% reset will take between 4 and 8 workouts to recoup, depending on what size jumps you make. If it's just a back tweak, as you suspect, you may not even need that light day, though it wouldn't be the worst idea to put in to be sure.
I am curious, though: Why exactly did you miss that first rep?