Secret IMO in the yak is to get close. Then get closer. Then about the time your ready to fire, get closer still.
Sit back, fly a low E loss pursuit. Let him blow all his alt & E with one move after the next. Just sit back in lag pursuit and wait till he's low & slow.
Wait till he's inside 150 yards and does one more of those moves that gives you a good shot. One that shows more than just wing edges & tail. When he does light him up, don't pepper him, don't play with it. Once you decide this is your best shot MAKE IT COUNT. Hold the trigger down till he dies or your out.