I have had a somewhat similar issue with my ridgeline. Shoots great (1/2 moa) consistently, however I have had issues with my POI shifting vertically between shooting sessions. One day it’s right on, the next day, it might be shooting 1.5” high at 100 yards. Everything is torqued to spec, same shooting location and very similar conditions. I have tried everything I can think of to resolve this issue, and also used a different scope on the rifle with the same result. At this point, I have determined that the issue is in the machining on the top of the action. When tightening my rail to spec, I believe it is pulling a slight warp into the rail. My understanding is that this puts the rail in a constant strain, which then puts the optic in a bind. I just finished bedding the rail to the action, which should resolve this problem. I’ll follow up and let you know if this does in fact fix the problem, if you’re interested!