Maybe you are not training correctly. I mean, that coach is good for:
ATTACKING (18)
-crossing
-creativity
-off the ball
-passing
TACTICAL (16)
-teamwork
-decisions
GOALKEEPER (18)
-handling
-reflex
-rushingout
-kicking
-oneonones
-aerialability
SETPIECE (16)
-setpiece
But, a 10% more could means 0,16 in spite of 0,14 in current ability. And, if the ability is over 15 (13 in GK) it could be 0,09 in spite of 0,07.