Daniel, Bruno hit the nail on the head, since you have a universal crossover it gets set for the weakest link which are the QS's and it is not uncommon for them to have quite high crossover points based on their positions in the room and the room itself. I wouldn't hesitate to adjust that crossover down to 80hz or 60hz as long as the front sound stage sounds good, you most likely won't notice any problems with the QS's down this low either as long as you are not using the YPOA EQ settings.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70