Re: First contact borg inconsistency?
It's not until Picard takes over the fleet and orders everyone to concentrate fire on what he knows to be a weak point that the cube starts taking heavy damage.
Seems like Picard would've pointed out that weakness during some tactical briefing during the years between the two Borg invasions?
"I had no idea you were so... formidable. " - Anan 7 to James T. Kirk, A Taste of Armageddon