if the default reference point where the VDGS is initially placed is 50m from the wall; 460 toggles are needed to move the VDGS to the right position!!
We can increase the speed with using Shift-arrow but, the main issue here is another one: why the default position for the Parking System is so far from the wall ? That seems to indicate some kind of issue with the scenery.
Are you using the SU10 Navdata option ? If no, has GSX read the correct .BGL ? If it's a Marketplace scenery, you absolutely need to enable the SU10 Navdata option.
In addition to that, if the parking spots are really that far off, assuming the scenery has been read correctly, I suggest starting fixing the Parking positions first, and then the VGDS, a reason why the move increase is faster when adjusting a parking position, is because we assumed you'd start by fixing the Parking position and the Stop position first, and the VGDS after that, so it's not expected having to move it so far.