Did the Enterprise's phasers in STID curve also? Or was it only the Vengeance phasers did the curving?
Enterprise' weapons didn't fire AT ALL in this movie, so it's a non-issue.
OTOH, re-watching ST09 I see that Narada's torpedoes fly in relatively straight trajectories throughout the film and only seem to change directions the instant they are launched. If FX conventions are considered consistent within a particular movie, you could at least see that the straight-line behavior of Enterprise's "phasers" in the first movie is equally consistent with missiles.
Interestingly, the script for ST09 also identifies the Jellyfish's weapons as "torpedoes."
Both ships were at warp speed when the Vengeance fired at the Enterprise, could explain the strange trajectory of the 'phaser' pulses.
I thought so too, at first, but the same effect is in evidence -- and somewhat more pronounced -- when the attack resumes under Khan's command.