Question 1:
With the arriival cue as written, the bombers will only arrive when the Baal's hull strength is exactly 50%. If the Baal's hull strength drops from say 51% to 49%, then the arrival cue won't become true and the bombers won't arrive.
Question 2:
It's that tricky Repeat Count at work. After the player first gets in range of the Oslo's FighterRecharge and gets charged, the game will check every two minutes if the player's near the Oslo's FigterRecharge beam, and if so, trigger the recharge. At any other time, nothing will happen, even if the player's near the FighterRecharge.
Question 3:
Umm... is there some weirdness in game mechanics that only occurs on Insane difficulty? Btw, it's spelled Akheton.