Usually I'm lazy and doing mass training drills

This time I trained 6 of my players (DL, DR, DC, DC, DMC & MC) with High Pressure. I've spent 300 rest's and statistically expecting to get around 450 skill points (player age and level are calculated into this). But I've only received around 150 skill points. Very dissapointed that I have noticed it after splashing 300 rests