SPEED LAND on quadplane

Hello friends I am trying to configure the speed of descent of the quadplane in the first stage, but it seems that there is no such function (LAND_SPEED_HIGH) for quadplanes …

I’m trying to use the following settings:
Q_WP_SPEED_DN 250 cm / s (before it was 150 … I changed it to 250 and it seems that it didn’t change anything, it keeps going down very slowly in the first stage … in fact it seems that there is no difference between the first stage and the final stage of descent !

Q_LAND_SPEED 50 cm / s