How to increase descent speed in RTL and POSITION

My DJI F550) Flamewheel is flying very well with most of the defdault parameters. However, when I use the RTL or POSITION flight modes, the speed of descent is VERY slow. Even with the throttle stick backed all the way down to zero, it barely comes down, taking a few minutes to descend from 150 feet.

What parameter needs to be adjusted to change this?

Thanks,
Joe

Safety> Land Mode Settings

Good luck.