I always turn down the drills I find I get a +1 every 3-5 practices/turn down. haven't bothered to count/test cuz at that rate its not even worth pursuing for me. I get the guaranteed reaction time +1 and the stamina/hustle +1 and go about my business.
The offensive consistency drill is ...weird. Its not always there, also the drill is hard for me for some reason. I generally don't bother. On my 95 ovr characters I don't notice NOT having offensive consistency so on my new player i usually just get my free throw +1 during team practices and move along.