I tend to save them during a week to actually 'see' the progress when I use them. 0.2 - 0.6 change a day on a player won't make any difference, I think.
Irie Lion FC
League Champion: S02, S03, S04, S06, S09, S10, S12, S13
League Runner-up: S01, S05, S11
Champions League Champion: S04, S06, S09, S12
Champions League Runner-up: S02, S03, S05, S10
Cup Runner-up: S06, S09