So...I should play 4 Def? Atm I play 3 def and 1 DMC.
nope, play the style you want, i have a treble with 3-1-4-2 and 44-2 at your level.
train SA only for the one you like to make him 6* (spent 50 green on him) and with a team like you i only did for 18-19 yo 5* player at AM or ST position with freekick