Dont bother upgrade ST he seldom score lol just wasting time coz the algorithm they create just focusing on midfield area expecialy AMRL position. Once u have *8 star both AMLR position dont worry the goals galore will come from them... since last 5-6 season both my AMLR top of the scoring and assist chart in the league and help me win the league & cups trophy...
while my ST is utterly useless so i dont bother to upgrade him i dont care my ST score or not he just dont justified the how football works in real life...
Mine AMLR both dont have SA but they already proven prolific scorer and assist hence 90% of my score and assist rates since forever were coming from this 2 players. It will help if u have strong CM / CDM too but not critical... both my AMLR 7* but still lethal than anybody else lol. Make sure their speed is in full limit.
For CD make sure their heading, tackling is full 340% coz they will help shore your defence more efficiently from high ball, set piece or dead ball situation. I used 3 CD's system and all of them already 8*. Once a while this CD will score and its feel good to see your defenders score lol. Its unusual effort but rewarding.
Since the useless update by nord@$$, i abandon DMRL position because its no longer efficient to train DLR with too many skills (defensive/offensive) abilities. Now i use 3 CM to cover midfield and it work so-so not terrorizing as usual so far. But when they gel later i will form formidable midfield next season.
For my GK now still young 19yo without SA but skills already reach 156% and in end season he will be 9* player. I have trained him since last season and he proved prolific and maintain clean sheets after another. I focus on gk attributes make sure it 250% and above he will be lethal in goalpost.
Another thing make sure all your 1st eleven stamina are above 160% if possible so they can cope faster and play multiple matches without losing too much energy and u can save your green pax from healing them. I rarely use green pax to heal just to powertrain only.
Imho u dont really need SA and its proven my less SA players can defeat any equal team with full of SA. So dont wasted your resource to train to get SA it just a fake indicators and do nothing for your team as a mutual component... the better wat power train all highlighted area then u will be mercurial no matter what unless there was a ****ing bugs in your matches then its another story...