I have always done it as for cup matches I play second strength teams and only concentrate on the league.
I just drew 1-1 in the league with a team 26% stronger than me and having boosted all 28 before the game, and now all 28 need a boost as everyone of them dropped morale ffs this is absolutely bloody stupid.
I had hoped things might have steadied out, but the new morale boost system makes no sense and obviously catered to make you purchase morale boosts, as I said earlier I’ve had enough they ruined the game