The NFL is being slightly unrealistic in guys hitting the target zone on players in motion.. at least the way they have been instructed.
When I was a teenager, going to camp after camp, the basics were watch and aim for the hips. However even at these camps, high school and college camps, that if you were looking to dislodge a catch.. aim for the rib cage and arms. A player that is in the motion of falling.. a rib cage shot quickly becomes a neck/head shot.
But the NFL in this case is trying to force change from the top and pushing it down.. it will take some time for the change to filter down and get back to the basics of aiming for the hips and gut with the shoulder and head to the side. Form tackling in the NFL is awful..
But to elevate the fines in the middle of a season without much notice and window to effectively define what is findable and what is not, seems a little knee jerk and unrealistic.. not to mention allowing for players to adjust to the change.
Also, how are they going to account for offensive players movements that put them into harms way and when they start to utilize the rules to draw extra yardage but changing their hit zone prior to contact. Guaranteed that offensive players, much like the QB's, will put a little extra "show" into drawing the penalty and fine/suspension. Simply drop your head/shoulders rapidly..
"The oranges are dry; the apples are mealy; and the papayas... I don't know what's going on with the papayas!"