For old system, it cost 55% condition to get the gain of 4. In new training, it cost 57% to get 4.
I also did that but I got little better with the old system - but at that time, all my drills was in lv1.

Using only pro level training: 31% for 3
Using only semi pro level: 41% for 3
*** That's the key question/answer.

if with higher level drill, we have less condition loss.
I don't think it has to do anything if it's about extra position, sa or quality.
But I suppose that if *** it's true, better to use higher lv drills for extra position and sa
I mean, if we have a defender and want to give him "defensive wall" sa , better use a lv5 attack drill than a lv4 defensive drill.