While I agree a warning might be appropriate early in the year, if I have the same subvarsity team again, then I will likely flag it.
Two other points about the new scrimmage kick formation rule. First, if the Kicker (punter) is less than 10 yards, the Snapper is not protected by the one second rule. While maybe not a big issue in an 8th grade game, this is a big issue on Friday night. Second, the Kicker (punter) still has Roughing the Kicker protection -- as long as it is "obvious that a scrimmage kick will be made".
Just a little something to think about heading into the weekend.