Yes, the normal advice on inverse curves is reduce. One inverse curve doesn't sway me, but if it keeps on happening, something ain't quite right. Also, I think when you raise, or lower, because of something wonky like this, it makes sense to make the adjustment somewhat significant. I don't know how much you can find out fairly quickly if you do like a .1 or .2 adjustment. My theory is that as long as the data shows you have "room to move" up or down, then a dose adjustment intended to "fix" something needs to be a big enough adjustment to illustrate that the right direction has been chosen.
Of course, it's specific to the kitty and the current dose, so a case-by-case basis. In this case, if I were to advise a reduction from 1.6, it would be to 1.2 or 1.0. That degree of dose change should indicate within a cycle or two that "down" is the correct direction.
The mid-cycle lows would be the indicator, to me, of how big an increase makes sense. If they are yellow, a bigger increase can be tried than if they are blue, for instance. Usually I look back at a month or so of the spreadsheet to see what seemed to work or not work. But with Asher, and Shakes as well, with all the recent upheavals and their worlds turning upside down, the "old data" isn't as helpful as with other kitties, you know?
Carl