Obviously the real problem here is not the battleship jumping (which is a perfectly reasonable tactic to avoid death), but the oorp sundiving after a blind jump. So instead of trying to nerf the jd, you should instead place rules that a ship that had a death-message after jumping out of an engagement is not allowed to re-engage. Thus, if a battleship really wants to re-engage after jumping, then at least they would be required to to input the correct coordinates for the region, and fly back to the nearest station for repairs and refit before re-engaging.
And if the battleship made the effort of having the correct coordinates, repairing itself the proper way then rejoining the fight, they should be awarded for their efforts in doing so.
