Squad balance

[Lewis98]

Anyone else having trouble getting their squad to the stage where it’s a ‘harmonious balance’ or above? 
Mines currently sat at unbalanced having been balanced all of the last season in my save. I know where the issue likely is in my squad but it’s so difficult to know the optimum size of the groups compared to squad size and the description doesn’t offer much insight.
Player buy-in is extremely high with over 50% of the squad devoted and only 1 player lower than enthusiastic. 
Really appreciate any info.