Manual L-jumps

I must be an idiot.
I’m in free form after 3 weeks beating the game and now I just can’t seem to get the manual jumping to work. I think I’m doing it right(if I were it would work right?) I select the liberity l-point in location finder+ and autopilot out there then clear waypoints in location finder, target the liberity l-point,bring up the starmap in nav and select the Remek l-point,backspace out of the starmap and fly through from blue to red at the speed limit 250ms. I have tried with Remek selected in target list and with liberity selected.
But nada no bright light no jump. dodge the gunstar (why did they put in the way?) and fly around for another try. I guys in station control must be ROTL by now. I suspect they will either blow me up or send a repair crew out to see what the problem is and then shoot when the find out how stupid really I am.