Looking at what might have happened if individual retreat was switched on for our ships (I have not taken the time to go over the Arcadian forces - their Frigates all got away before the battle lines reached the stations, the stations shouldn't be able to escape, so it would just be working out if the Cruisers had orders to hold at all costs.)
For our ships, looking at USS Endurance (disabled), USS Sojourner (disabled) and UES Jupiter (held together with duct tape and prayers). USS Thunderhead (destroyed) was one-shot when her shields failed, so individual retreat rules could not come into play.
If the ships were set to <50% hull - retreat:
USS Endurance (Excelsior)
Part of the Heavy Metal force, joined battle on turn 135
Took a critical shield hit on turn 152
Lost shields on turn 164
<50% Hull on turn 271 - at this time had lost 0-1-0 crew.
From this point on, Endurance did another 3.89 damage and lost another 4-1-1 crew.
Endurance took just 1 hit between this time and the shot that killed her.
USS Sojourner (Excelsior)
Part of the Heavy Metal force, joined battle on turn 135
Took a critical shield on turn 189, loosing shields and Reaction sub-system.
<50% Hull on turn 242 - Warp sub-system out for 19 turns!! <<<<< no retreat until repaired anyway.
From this point on, Sojourner did another 2.23 damage and lost 1-1-2 crew.
Sojourner was fired on 4 times (1 evasion) before taking the fatal hit.
UES Jupiter (Constellation)
Part of the Vanguard force, joined battle on turn 80
Took a critical shield hit on turn 351, also reducing ship below 50% hull and knocking out the Sensor Sub-system.
From this point on Jupiter did another 5 points of damage and lost 1-1-0 crew.
Jupiter was fired on twice more before battle end.
Jupiter actually had better performance than both of the Star Fleet Explorers when heavily damaged.
In my opinion, all three of these ships should have attempted to fall back, as there was no need for them to remain in the battle line. Sojourner lost Warp capability, so she would not have been able to retreat until that was fixed - we probably still would have lost her. Even just getting Endurance out of the battle line would have saved us a large portion of our crew losses.