Well I dont get 100+ kills per sortie but Im consistant with landing my kills or returning from each mission. Heres some thoughts...
Got to always have a plan before you take off. While on the ramp or even before, start planning.
Always fly your plan within its envelop. Use its advantages to the fullest. Attack your preys disadvantages. Easy right... Everyone knows that.
Your gunnery skills must be good. If you have average gunnery skills, you must be a fantastic acrobatic flyer. If you gunnery is exceptional, you can get away with less fancy flying. Some guys are fantastic shooters and flyers.
Know how you will probably get killed or who is gona kill you out there. Part of "situational awareness" but also part of the plan before you roll the ramp. The better planned mission, the more obvious it is how you might die or who might kill you. See above, plan well.
Always know when its time to return to base. Every vector you take must have a egress vector in case you get into unexpected trouble. An escape route. Knowing when to RTB is the secret to coming home alive from each mission.
Thats about it.
Oops, you need to bring alot of gas. Usually it takes a while.