Just a guess but I bet it has something to do with the swingweight or balance point of the shaft.
swingweight might be a bit too light causing it to feel a bit dead or firm.
or it could be that it’s a higher balance point shaft and that’s not something you’re used to? Or vice versa, you’re used to a counter balanced shaft and the ascent is not. I know nothing about the ascent to weigh in on the particulars of that shaft.
Can’t really explain why the Ascent would feel that much different in the Max, but sometimes switching heads can make a club perform or feel differently. The Ascent flex ranges are pretty average, meaning that the R flexes are average for all R flexes. They are not on the stiff side of the range or the flexible side of the range. Based on your swing speed, I might suggest going to a 50 gram weight in the R flex, in either the Ascent or something like the Rapport Core Blue. We developed the Core Blue with VA Composites and it has performed well. Better price point if that matters. I do not believe your giving anything up based on price. Again, the Ascent is a good product as well, but since your experience what your experiencing, might want to try something else. The Aldila NVS in the 55 R might be another option. Similar profile to the Rapport. The Ascent in the 50 R would be slightly more flexible in the butt section than the Rapport and the NVS, based on the data we have in our database.