When in the route tabs your IFS reputation is determined by the IFE of the aircraft and the IFS combined. So what you can do, and what I usually do is combine a 5 or 4 star IFE with a 3 star IFS.
For domestic flights(or any route under 3000mi) my IFS consist of 6 free level 3 snacks, newspapers, headphones, kids entertainment pack, blankets, and pillows all for free. For international flights (over 3000mi) I used the same items but also add 1 breakfast, lunch, and dinner. All of the non food items must be free so that it is a one time cost making it cheaper for you. This should grant you three stars.
For a 5 star IFE all you need is level 5 projectors(20 per 100 seats), and level 5 audio on demand. Costs should look something like this
Screenshot_20170530-094420.png 338.73KB
0 downloads These cost may seem high, but my airline uses these IFS and I make profit just fine, considering how many spamlines and LCCs that I constantly compete with.