Uhmm...as i read from other managers, i assign SP's ONLY on Physical & Mental to get more speed, since i do that i gained 3 consecutive qualifications (after be parked 2 seasons for tanking). Now, some players have reached that "upset" showing about 20 points between them (with Defence or Attack) but their performances are still good (7/8 rating). In fact sometimes i have to assign points not on Physical but others.
Is this the relationship you're talking about?