Push since beginning, think that drills have a cap, of 180 x the number of skills that each drill trains, this means that those mixing grey/white skills will colapse sooned, if yougain grey skills during 1 week that you don't do a specific training focussed in the appropiated skills to maximize the drills capacity.
focuss in the main contributive players, the 3 best ones, and keep others in good avq to compete. Try to have a phisical skill like fitness or speed till 200%+ and use drills that give you more gain based on what I mentioned, about the collapse and that cap that drills have. The less completed is a drill, the more will give you when using it to progress when training a particular attribute, so think in it.