So we are at least two having this GLIDESLOPE problem.

To answer your second question:
in the VC you can raise or lower the seat by SHIFT BACKSPACE or SHIFT ENTER.
With Shift +/- you can zoom in and out .
With CTRL Backspace/ENter you can move the position backwards or forwards.
With all that and the help of the arrows (left,right, up, down) you can
choose exactly the position you like.

Guy