Hi,
You can set the trigger (or add another trigger action) to 'On Trigger Stay'
But if you are dragging something with your mouse fast it might still not help as it will depend on your frame rate.
Something that might help is when start drag get the position, then next frame get the next position, then do raycast between the 2 points.
then set then 'next position' variable to the 'current position' variable
and loop (do next frame and get position again)