Tactics Inconsistent tactic - Help needed

[LarryA]

This is a 4231 tactic I've made for arsenal. It led me to be top of the prem after 30 games, then a run of bad got me 6 points from my last 8 games. However we finally won the European crown beating spurs in the final?

End of season stats

Some fixtures

Poor form

Manager stats

In conclusion this tactic was very good until April. Can someone test it for me and suggestions for improvements would be very useful. 

[LarryA]

Slight adaption during the season

[Brenty92]

It may have become inconsistent due to 1. Two inside forwards and a striker fighting it out for the goals, 2. The fixture list generally gets a lot tougher in the business end of the season and finally 3. Your playing centrally and the opposition may have figured it out and countered that with a lot of bodies in the centre of the pitch i.e. 3 CM's 

[LarryA]

Brenty92 can you show me a screenshot of the changes you would make in order for the results to be more consistent 

[Brenty92]

Could swap the DLP to a BBM aswell, balanced or attacking depending on your preference

[gbohunmi10]

Get a better left back. Play fullbacks instead of wing backs . And try BBM x Bwm combo

[LarryA]

Brenty92 or gbohunmi10 can you guys test the tactic for me or give me recommendations for teams to test the new improved tactic with

[Brenty92]

1 hour ago, LarryA said:

Brenty92 or gbohunmi10 can you guys test the tactic for me or give me recommendations for teams to test the new improved tactic with

Don't have enough time to test mate sorry

I would test it with someone like Chelsea, have perfect players for the player roles