In general Holding is legal if the linemen is standing up.
Our players are not getting past the blocker. When our smallish Dt 285l# and very small d end 240# rush directly into the giant o l 330#, the o l men grab them inside the pads and pull them into their body. Until our d folks get some separation and are making a play, it is not holding. Then its got to be flagrant. When we stunt or slant, our quicker d l guys have a slightly better chance for call.
What I hate seeing is our dl getting grocery carted back 2 yards and then trying to grab the rb when he goes by. Add the lb on the srong side and its pretty sad. Since we have done slant or a very brief chuck before rolling into the hole, we have had some very successful stops for no gain .
Our o l is doing more holding as well.
Until our dl guys bulk up it is what it is .