the circumstances were totaly different than in an open battle.
They would do it like the Spartans did against the Athenian lights who in the end defeated the Spartans without any Athenian Hopilites, just by waring them down with javilins and arrows. If you recieve casulties and can't give any back you will try and close with the lights to stop the shooting thats what they did the lights ran away came back fired again and on it went till the spartans were worn down. Thats what lights do and FOG seems to work well using them.
For the rest then i wonder if LF was so effective why the 1/2 dice for shooting? And should it not be the role of the now almost useless MF bow or crossbows to force reaction?
I understand that eager undisciplined shock troops would be tempted to charge the LF, but regular disciplined i am sure would not.
LF should be a nuisance not a tool to open up a battle line by giving no other choice than charging the LF to make them go away.
Way i would see it:
LF in front of any troops but LF or LH retreat to their rear or away from the ennemy when the ennemy advances but the minimum distance between the two would be 1 MU.
The ennemy units should first do first pass a CMT not to charge if undrilled or skock.


