Yep, never happy about a miss, especially at the time, but maybe it's time for some adjustments. Have you used the woody's yet? maybe adjust the percentages for shoulders. It seems like alot to go from a triple @175 to 195 for singles. 20 lbs is alot on OHP. I would also not be afraid to make instinctive calls to adjust the last set if the next to last set had a grinder in it. Sometimes the body just doesn't want to go according to plan, but if we work with it we are still making progress. I think that is the biggest flaw in programs with prescribed numbers, like 531, in that most of us forget to consider making audible changes on the fly. Heck, I don't think I ever once did that while on 531, and I should have.
Who knows, maybe next week your body will give you that 195 and it might even feel easy-ish!