Copter: Flowhold mode too sensitive compared to other modes

I would like to use FlowHold mode with a hereflow and without GPS in my copter but the controls are too sensitive. I can’t find a way to add exponential to reduce the UAV’s tilt angles or a way to adjust the sensitivity of the controls. The controls are well adjusted in the other modes (Althold, loiter) but in this mode the piloting is really too sensitive while the UAV stabilizes well when all the controls are released. Why is the Flow mode more sensitive than the other modes?
I use a Herelink radio with its hereunit receiver.