Jim Starluck said:

During the climax of the Battle of Yavin, when the Millenium Falcon comes roaring towards the camera from out of the sun, have it be blazing away with both gun turrets the whole time. This way, Vader's wingman can be trying to dodge the laser fire that just killed his buddy, instead of crashing into Vader in a blind panic.

It makes Han's return a lot more dramatic (right now it seems like he just fires a single well-aimed shot and dumb luck takes care of the rest) and eliminates a logical inconsistency, since Vader's wingmen would most likely be elite pilots and not prone to such stupid mistakes.

I never got the sense that his wingmen were HIS wingmen. In the DS scenes just prior, Vader turns to two pilots walking by and says "Several fighters have broken off from the main group. Come with me." He just recruited the first two pilots that were handy at the moment.