For those who are having trouble, obviously there's tweaking you have to do according to the players you have. After the new patch came, all my previous tactics went down the toilet, so I'm trying and adjusting new formations, grabbing ideas from you guys.
I always try to posesssion tactics, tried this one, but changed to a more fluid system, which allows my more creative players to pass with more freedom, roam from position and move to channels. Also, according to your FW's, you can switch between F9 and TQ according to who's playing. For example, I have Roberto Pereyra and Felipe Gutierrez. Both are fast, creative, and have scoring capabilities. Instead of having one AP and one DLP, I have them both as AP's, one with attacking duties and the other supporting. They always keep the pitch tilted in our favour with my DM (Lucas Romero thrives as a DM instead of HB or A), keeping my defense safe.
I also have Fischer and Douglas Costa in my Everton save. Fischer as a TQ is a monster, and Costa is a beast as F9 getting double digit assists by the first half of the season.
If you have strong AML/AMR, I have IF (attacking duty) and a W (support role) and I exchange roles according to games and strategies.
When I play against a narrow 4-4-2, I use 2 wingers to spread their midfield, but once I became a dominant team, I stuck with 2 IF's, one with support duty and other with attacking duties, the same as with my WB's (which I also used as CWB for a while).
You gotta go with what you got, your player's developments, and what suits the team's strengths.